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How to find & cure the source of animal odors:
Pet / animal urine or other odor diagnosis & removal in buildings starts with finding all of the smell sources & causes. This article series provides suggestions for finding and removing animal or human odor removal from building interiors, building exterior surfaces, from soils around buildings or from urine-odor smelly clothing, bedding, and other soft goods.
We discuss how to find where animals are getting into your building and how to keep them out, including bats, birds, rats, mice, and squirrels and even raccoons. We explain the use of a black light or UV light to find the location of human, pet, or other animal urine and we describe the use of UV lights in forensic investigations.
This article series includes lists of products & formulas for odor cleaning or smell removing chemicals, washes, products.
We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.
Pet Odor Guide: How to Find, Test, & Remove Pet Odors, Pet Odor Detection, Cat, Urine, Dog Urine, Bat, Bird, or other Animal or Human Smells in Buildings
This article series begins here with help on finding the source of urine or animal smells at or in buildings, we give advice concerning the detection and removal of animal smells & odors from dogs, cats, or other pets.
[Click to enlarge any image]
This article series focuses on removing pet or other animal odors from buildings due to pet urine, pet feces, wild animal urine, or even human urine on and around buildings or on clothing and other soft materials.
Cat allergen and odor source identification, testing, removal, are also discussed beginning at Cat Dander: how to inspect and test a building for past or current presence of cats, cat hair, cat dander, and cat allergens".
Animal smells in or around buildings, both indoors and outside, may be due to current or prior pets in a building, pet urine or fecal waste, cat boxes, animal hair, dog dander, cat dander (are allergens and are indicators of the level of prior pet activity), dust tracked in by dogs.
The little stuffed animals in this photo include a skunk - both were innocent of any pet-crimes, but they had been placed at either side of a basement door jamb to cover stains from basement water entry. Prior flooding in buildings or prior sewer backups can lead to hidden bacterial or mold reservoirs that are both an odor source and a potential health hazard.
Suggestions for Finding the Source of & Removing Animal Odors Indoors
Start with advice on how to find the source of pet or other animal odors, including urine odors
Determine that animals have previously been in the building even if there are none there at present. Look for scratches, stains, and odors as we describe below.
Pet doors and fences also tell the history of the type and size of pets that have been in a building.
Also see BLACK STAINS from ANIMALS for a description of the cause and cure of various types of stains caused by pets or other animals in buildings
Follow your nose - often pets were confined to particular rooms or areas of a home
Allergic reactions - of people to entering or spending time in a building may be due to the presence of animal hair or more likely animal dander from dogs, cats, or other pets.
A carefully selected dust sample from a building is an easy screen for the presence of animal dander including dog dander, cat dander, evidence of rodents, dust mites, insects and other allergens.
Where appropriate, other chemical assays for allergens are also present, but we advise against ordering costly tests that may risk inaccuracy if the sample itself is not selected by an expert.
Use your eyes - you may see pet scratches on one side of a door (photo at left), telling you where the pet was sequestered. Also look for teeth or claw marks on window sills, door trim, stair parts, flooring baseboard trim, or any other component that an animal may be able to bite or gnaw.
Pets shut into a room may urinate in that space, particularly near a door leading to outside or around a large piece of furniture, or if territory marking, often against a wall.
Look outside too for Bats, Birds, Rodent Entry Points - if your building has been invaded by bats, rats, mice, squirrels, or other wild animals, you should inspect both indoors and outside for openings or stains and marks that indicate points of entry and exit for those creatures.
Watch out: before sealing up a hole in a soffit or wall where squirrels or bats are entering your building, make sure the animals are not going to be trapped inside where they will be mad, frightened, hostile, even dangerous (like a rabid raccoon), or ultimately dead and another source of stink.
Consult with a pest control professional who may have a practiced eye at spotting where animals are getting into your attic, roof, walls, basement, and who may be able to provide a repellant that will at least temporarily drive them out - alive. While there are no bat control poisons currently approved in the U.S., we have found that moth balls (naphtha) are an effective repellent for bats and squirrels, though naphtha odors are also repellent to some humans.
Watch out: also for wild animal bites, bacterial and viral hazards when entering confined spaces where invaders are or have been present.
The author (DF) became temporarily ill after (foolishly) working in a "clean looking" crawl space that later we realized had a heavy contamination of fecal and urine contaminated mouse dust. Bat and rodent droppings as well as bird droppings can be a source of a pathogen potentially dangerous to humans, the fungus Histoplasma capsulatum.
Birds in the Roof Structure or attic may be entering through a hole they managed to peck in a roof overhang or soffit such as shown in our photo at below-left. Birds in the Attic at infestation levels may be obvious if you spot bird dropping stains such as those shown on our photo (below-right)
Look for stains - on floors or walls, where pets urinated or marked spaces;
The dog urine stains (dark spots on the wood floor) in our photograph just above went un-noticed until the property owner removed smelly carpeting and carpet padding. These stains, leaving both visual and olfactory mementos of the perpetrating pet who was long departed, cannot be removed by light sanding - flooring replacement would be necessary as the stains were deep into the wood.
The owner elected to re-seal the floor against odors.
Look below smelly carpets as often urine has soaked through carpets, carpet padding, and has entered the subflooring or finish flooring wood materials.
In this urine-stained corner we found that the pet urine had penetrated carpet padding as well.
Look below vinyl sheet flooring and vinyl floor tiles in an area where pets may have urinated. Readers have reported finding pet urine that had soaked into backer material or even cardboard or paper underlayment that had been placed underneath vinyl floor tiles.
A reader reported that on pulling up the laminate portion of flooring they found pet urine-soaked paper backing material that had remained glued to the subfloor.
The urine pattern was found around the perimeter of where a bed had been placed - the pet had urinated repeatedly on flooring around, but not under, the bed.
Use a "black light" or UV-light to look for pet urine even where no stains are visible. Small black lights are available from pet supply stores, art supply stores, and forensic and police equipment suppliers and are generally inexpensive.
Both plug-in and more convenient battery-operated black-lights are available. Use the black light in dark or near dark conditions for the best view. Urine will shine a bright yellow color in this lighting. Details are at UV LIGHT BLACK LIGHT USES.
Also check for dead animals in building attics, crawl spaces, wall or ceiling cavities and in duct work or air handlers or chimneys.
Animal odors in buildings can occur
when an animal such as a mouse or rat has died in a building cavity. A dead animal smell has been described by our clients with a wide variety of terms ranging from a vague noxious stink that seemed to vary with humidity to a sweet sickly smell.
Dead animals or even insect nests
in building plumbing, especially building vents, can also produce unexpected sewer odors - see Septic and Sewer gas odor links discussed below.
Rodents, especially in the HVAC system such as air ducts, may also be a bacterial or Hanta virus hazard.
Advice for Keeping Mice and Rats and Squirrels out of Your Home
Pest control experts recommend several simple steps that will discourage mice and squirrels from moving into your building as they are inclined to do particularly at the beginning of cold weather:
Housekeeping: clean up spilled food, seal food in rodent-proof containers
Pet food: we found that storing open bags of cat or dog food invited mice into the same area, a problem solved by keeping those large pet food bats in a small metal covered garbage can. We also stopped leaving pet food in bowls overnight.
Garbage: garbage and trash cans should be made of metal and kept closed; clean up any spilled garbage around your trash cans both indoors and outside.
Seal Building openings: as we discussed above about bats, look outside for openings into the building such as at soffits or roof eaves, especially near overhanging or close tree branches (squirrel highways), and close to the ground look for openings into the basement at vents, windows, or building sill plates and siding bottom edges. Seal these when you won't be trapping animals inside. We have read that mice can enter a building through openings as small as 3/8"!.
Trim shrubs at least a foot away from the building walls; we prefer 18". This also reduces the attractiveness of the building to insect pests such as termites and carpenter ants. If your home is in an area where Norway rats are a problem, keep low growing shrubs away from your building walls entirely as those rats burrow under them, especially Junipers and Taxus.
This website provides articles on to diagnose, test, identify, and cure or remove a wide range of obnoxious or even toxic
odors in buildings and in building water supply.
We discuss odors from a variety of sources including
animals including pets, dogs, cats, or unwanted animals or dead animals, formaldehyde odors in buildings from building products or furnishings, plumbing drains, plastic or vinyl odors from building products, flue gases, oil tanks or oil spills, pesticides,
septic odors, sewer gases, and even abandoned chemicals at properties.
Reader Question: Animal or pet feces or urine odors: tracking down a rancid sweet wet paint odor in one room - suspected pet odors from urine or feces
What could be the source of an odor that smells like rancid, sweet, wet paint? The smell is contained to one room of our house, it builds up when doors and windows are closed, is all the time and we can't pinpoint exactly where in the room. We moved in 4 months ago, and it smelled.
We thought it was wet paint (previous owners painted) even after weeks and weeks and no other room (that was painted) smelled. We wound up gutting the walls down to the studs, replaced insulation, drywalled, and painted. It smelled like fresh wet paint, and when that dried we were back to the same offensive odor. We've tested for mold with an IH, tests were negative. Please help!!!
We are desperate, it's my youngest daughters room and she has been sleeping in her sister's room until we can figure this out! Thank you. Wendy K. 11/6/11
Unbelievable Wendy but we seem to have the same thing going on in one small area of our house, a slightly sweet paint, disinfectant or perfume smell. We aren't sure which.
(We moved in 12 months ago and have looked behind the walls in the soffits and in the adjacent crawlspace and found nothing.) We have been ventilating the entire time but the smell is still there when we close the room up today. I am going to do the patch test next week. - Chris 11/18/11
Hey Chris, did the patch test help you identify anything yet? Did the previous owner have pets? Ours had a big dog and after all our attempts, we are down to the floor.
We are thinking (hoping) it just might be an abundance of dog urine that soaked through the wood floor. My husband found a product at PETCO that addresses this, something specific for dog urine removal. It is kind of perfume itself but we doused the floor twice and are crossing our fingers. Good luck! - Wendy 11/28/11
We had a dog defecating and peeing and leaving it on cement in garage and tile in basement entry, so it's not discovering the cause but curing it.
One door frame and the door (as its' a set) was affected and will need to be replaced- but can the floors be cured of the odor? A company that was supposed to take away that smell came and failed to do so. I heard that putting pet product liquids for pet waste is another way to work on it. What would you recommend? - Elaine 3/8/12
Reply: pet odors in buildings and success with removing them: clean & seal surfaces or remove materials
Chris & Wendy:
Our experience is that dog urine can soak deeply into wood flooring, especially if the floor was covered by carpeting and the urine thus remained for a long time.
Odors from dog feces are usually easier to cure if the feces were on a hard finished surface, but feces dropped on concrete (a garage floor) or tile (grout joints) can leave oils and fluids that soak into those surfaces.
While commercial deodorizers can reduce the complaint, and some enzymes can actually break down organic molecules that are part of an odor problem, it's often the case that sanding, re-finishing, sealing, or even flooring or drywall and trim replacement are needed.
Where a surface is to be left in place, such as a garage floor, try using a commercial concrete or tile cleaner followed by thorough rinsing (vacuum up the rinse water if it's in a basement or garage that can't be hosed to outdoors. Then when the surface has thoroughly dried, if odors remain you may need to try coating the floor with a sealant. Some of the fungicidal sealants used in mold remediation or odor-controlling sealants used in response to fire damage in buildings can cure the remaining problem.
Question: dead fish (dead animal? odors in the kitchen - how to locate a dead animal in walls or ceilings
There is an odor in my kitchen that is likely a dead small something. I have looked behind refrigerator and stove, and removed anything that can be looked under. But there are floors under cabinets that would require carpentry to remove the shelf....want to know that that is the spot before I begin. How can I identify the location of the odor? Is there any gadget for that? - Jane
Reply: try a borescope before destroying cabinets or walls
I'm not sure it'll work in this case, Jane, but try our
SMELL PATCH TEST to Track Down Odors (article link at the "More Reading" links at the bottom of this article )
to see if that helps pin down the most smelly area.
I'd see if the odor can be traced to a drain line.
Also, look for a dead mouse or other dead animal under an appliance (fridge, dishwasher), or under a cabinet, or even in the walls;
Finally, you may find a local home inspector who has a flexible borescope that can peer into tight areas such as under cabinets either by snaking the scope through an existing gap or opening or by drilling a small unobtrusive hole such as i the top of kick plates below your cabinets or in walls where odors seem strongest. An example of using a borescope is provided at HIDDEN MOLD, HOW TO FIND.
Reader Question: Mold or dead animal smells: smell in the master bedroom closet lingers even after some demolition; attic mold is supposedly "dormant"
I hope you can help me . We have a 7 year old home and we have a smell in the master bedroom and master closet. Both are on the same wall (south)we have a real bad odor that we have never encountered before.
We tore out the carpet with no good results. We have mold in the attic above attached garage but not
close to where the smell is. We were told this is dormant? dead? and not the cause of our odor problem.
I have put the smell patch on three walls and also put plastic insulation on the windows - Pat--Boo20@att.net
Reply: dead mold may not be; other places to look for mold as an odor source
If the odor is a moldy musty smell, and considering that you found attic mold in the building, I'd look for a source of leaks or trapped moisture. Perhaps cut some small exploratory 2" x 4" openings in the drywall at the most-suspect areas to permit a visual inspection. Same if it's a dead animal.
I would not assume that "dead mold" is really "dead" - dormant mold, meaning mold growth on a surface that is not producing active growth, can become active seasonally with variations in humidity, temperature, light, and other conditions, and can outgas MVOCs at times - depending on the genera, species, and surface on which the mold is growing. Also the fact that someone saw a significant mold reservoir in one building location should make us alert for the possibility of other undiscovered leaks and reservoirs to be found.
Also see MOLD in BUILDINGS Procedure: what mold is often found where in buildings - simple technical presentation
Reader Question: problem with raccoons in the attic
We have NO ODOR. However there have been raccoons in the attic & I want to get someone to test the air quality for allergens related to the raccoons having lived in the house/attic.
My father has a lung disorder & because there are NO ODORS I am wanting to dispel the notion that his lung problems are related to this. I am DEFINitely also in the process of having the raccoon problem alleviated. THANks - Donna 7/12/12
Donna I am skeptical that "air testing" or "air quality testing" is going to provide any definitive data on the presence or absence of an air quality issue due to raccoons whatsoever, nor am I confident that allergens you'd find would be related to raccoons in the attic. You might test the occupied space, including settled dust, for high levels of insect or animal allergens, including dust mites, animal dander, insect fragments. "Air tests" alone can give results that are "wrong" by several orders of magnitude when looking for particles.
When raccoons invaded our house through an open soffit we found them returning night after night to open a box of shiny Christmas ornaments that they considered great fun to bat around the attic floor. The remedy involved these steps:
Wait until the raccoons have left for the day - don't confront a raccoon cornered in your building or you're asking for a fight and maybe a bite
Close off their entry opening
Clean up the mess and if necessary use a sanitizer.
If you're not up to these steps call a local pest control or animal control professional.
Continue reading at ANIMAL or URINE ODOR REMOVAL or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.
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(Dec 31, 2014) Pat said:
I just rented an apartment. I discovered it has a foul nauseating smell. I now suspect the issue is that cat urine has saturated through the carpet into the wood and everywhere. It is disgusting and I have to move out. My question is how do I prove this to the landlord or a judge? I need to get out of my lease because I know the landlord will not want to spend monies to truly fix the problem. Thank you!
You can document the presence of the odor with witness's, black light, and lab tests of a sample of building air.
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Judy and Don Doje, Doje's Forensic Supplies, P.O. Box 500, Ocoee, FL 34761
[2a] Ulrik Runeberg, Conservador, Museo de Arte Contemporaneo de Puerto Rico, San Juan, Puerto Rico
 U. Illinois Dept of Physics, http://van.physics.illinois.edu/qa/listing.php?id=1913
 Glow Paint Industries, an Australian company ( 07-5483-9181) http://www.glowinthedark.net.au/ claims to provide the world's longest list of products that glow in the dark, listing toys, party supplies, home improvement products, recreation & sport products, paints, and more.
 FEIT ELECTRIC COMPANY, INC.
4901 Gregg Road
Pico Rivera, CA 90660-2108, Tel: (800) 543-FEIT (3348), website: http://www.feit.com/ web search 5/14/2012
 "What You Need to Know about UL 1598, 3rd Edition", Intertek, Tel: 800-967-5352, USA, offices in the Americas, Germany, Sweden, Asia Pacific, Italy, UK. Website: www.intertek.com/lighting, web search 5/14/12 [Copy on file as UL-1598-White-Paper.pdf]
 "ANSI Coded Light Bulbs", Bulbstock.com, web search 5/14/12, original source: http://www.bulbstock.com/AnsiCodedLightBulbs.html
 ANSI American National Standards Institute, website: www.ansi.org [Don't expect to easily find anything you need to know at the ANSI website - Ed.] Example: [http://www.ansi.org/news_publications/news_story.aspx?menuid=7&articleid=2628]
The National Electrical Manufacturers Association (NEMA), on behalf of the American National Standard Lighting Group (ANSLG), has published ANSI/ANSLG C78.81-2010, Electric Lamps - Double-Capped Fluorescent Lamps - Dimensional and Electrical Characteristics. The recently published standard sets forth the physical and electrical characteristics of the principal types of fluorescent lamps intended for application on conventional line frequency circuits and electronic high-frequency circuits.
ANSI/ANSLG C78.81-2010 revises a 2005 edition and provides specifications for the lamp itself, the interactive features of the lamp, and the lamp ballast, including conventional systems relying on auxiliary support from external ballasts. In addition, three new fluorescent lamp data sheets are included: 25-Watt, 48-Inch T8, High-Frequency Fluorescent Lamp; 28-Watt, 48-Inch T8, High-Frequency Fluorescent Lamp; and 30-Watt, 48-Inch T8, High-Frequency Fluorescent Lamp. Only double-based lamps of the regular linear shape are included in the standard; single-based compact, circular, square, and U-shaped lamps are found in NEMA/ANSI C78.901:2005, For electric lamps single base fluorescent lamps - dimensional and electrical characteristics.
NEMA, an ANSI organizational member and accredited standards developer, is a membership organization of manufacturers of products used in the generation, transmission, distribution, control, and end-use of electricity used in utility, medical imaging, industrial, commercial, institutional and residential applications.
 Wikipedia provided background information about some topics discussed at this website provided this citation is also found in the same article along with a " retrieved on" date. NOTE: because Wikipedia entries are fluid and can be amended in real time, we cite the retrieval date of Wikipedia citations and we do not assert that the information found there is necessarily authoritative.
Entry on color temperature, 5/14/2012, original source: http://en.wikipedia.org/wiki/Color_temperature
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Entry on Wien's displacement law, 5/14/12, original source http://en.wikipedia.org/wiki/Wien's_displacement_law
 "Notes on LEDs & Kelvin Color Scale", Autolumination, website: autolumination.com, web search 5/14/12, original source: http://autolumination.com/colors.htm [copy on file as LED_Notes_AutoIll.pdf]
 Light Booth, Type LBM-B", Mathis. Mathis is headquartered in Brasil (Website: http://www.mathis.com.br/, Email: firstname.lastname@example.org) with offices in Switzerland & the USA and other countries. Werner Mathis AG
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E-mail: email@example.com, Mathis (India) PVT. LTD.
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E-mail: firstname.lastname@example.org, and Mathis (India) PVT. LTD.
203, Swastic plaza
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Phone: +91 22 2585 4304
Mathis provides a lighting boot for visual assessment and comparison of colors, use to compare color variations and metamerism on samples. The light booth provides four or five standardized light sources (daylight -D65, fluorescent -TL84, incandescent - A home light color temp. of 2,856, ultraviolet - UV to evaluate optical brightener or fluorescent dyes, and a 5th optional lamp providing D50-artificial daylight 5,000K, D75-artificial daylight 7,500K, H-horizon light 2,300K, CWF- store light, cool fluorescent 4,150K.) Web search 5/14/12, original source: http://www.mathis.com.br/arquivos/PDF/ing/LBM-ing.pdf, [copy on file as Mathis_Light_Booth_LBM-ing.pdf]
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
Kansas State University, department of plant pathology, extension plant pathology web page on wheat rust fungus: see http://www.oznet.ksu.edu/path-ext/factSheets/Wheat/Wheat%20Leaf%20Rust.asp
"A Brief Guide to Mold, Moisture, and Your Home",
U.S. Environmental Protection Agency US EPA - includes basic advice for building owners, occupants, and mold cleanup operations. See http://www.epa.gov/mold/moldguide.htm
US EPA - Mold Remediation in Schools and Commercial Building [Copy on file at /sickhouse/EPA_Mold_Remediation_in_Schools.pdf ] - US EPA
US EPA - Una Breva Guia a Moho - Hongo [Copy on file as /sickhouse/EPA_Moho_Guia_sp.pdf - en Espanol
Allergies, Allergens, Allergy Testing in Buildings - References & Products
Allergen Tests in Buildings advice about how to test, what to look for, in evaluating the level of dog, cat, or other animal allergens in a building
"IgG Food Allergy Testing by ELISA/EIA, What do they really tell us?" Sheryl B. Miller, MT (ASCP), PhD, Clinical Laboratory Director, Bastyr University Natural Health Clinic - ELISA testing accuracy: Here is an example of Miller's critique of ELISA
http://www.betterhealthusa.com/public/282.cfm - Townsend Letter for Doctors and Patients
The critique included in that article raises compelling questions about IgG testing assays, which prompts our interest in actually screening for the presence of high levels of particles that could carry allergens - dog dander or cat dander in the case at hand.
http://www.tldp.com/issue/174/IgG%20Food%20Allergy.html contains similar criticism in another venue but interestingly by the same author, Sheryl Miller. Sheryl Miller, MT (ASCP), PhD, is an Immunologist and Associate Professor of Basic and Medical Sciences at Bastyr University in Bothell, Washington. She is also the Laboratory Director of the Bastyr Natural Health Clinic Laboratory.
Allergens: Testing for the level of exposure to animal allergens is discussed at http://www.animalhealthchannel.com/animalallergy/diagnosis.shtml (lab animal exposure study is interesting because it involves a higher exposure level in some cases
Allergens: WebMD discusses allergy tests for humans at webmd.com/allergies/allergy-tests
Animal Allergens: Dog, Cat, and Other Animal Dander - Cleanup & Prevention Information for Asthmatics and regarding Indoor Air Quality.
Recognizing Allergens: What various indoor allergens look like - identification photos to help identify pollen, dust mites, animal dander, toxic or allergenic mold - Common Mold and other Allergens, Irritants, Remedies & Advice
Rodent control issues, including dander, fecal, and urine contamination of Buildings and Building insulation are discussed at our
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The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume.
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