But how do you know where the cat pee or dog urine is located when it’s dried?
In this article, we are going to teach you how to find pet urine stains using a black light.
Table of Contents
- What is a black light, and how can it find pet urine?
- What kind of blacklight is used to detect cat urine and dog urine?
- How does a blacklight help in finding cat urine and dog urine?
- How do you find pet urine using a black light?
- How to remove pet urine and stains
What is a black light, and how can it find pet urine?
Black light is also known as ultraviolet or UV light. UV light is simply light with a frequency higher than visible light. Okay enough of that, you aren’t here to learn physics right now. Just think of a rainbow and the different colors.
Water crystals break visible light into a spectrum in the rainbow where red has a lower visible frequency and violet has a more highly visible one. Anything lower than red is called infrared (which can be sensed as heat but you can’t see it), and anything higher than violet is ultraviolet light. This is why it’s known as black light because it’s not visible light.
Black light has many applications. For example, most paper money and some documents have markings that are visible under black light to prevent counterfeiting. UV light is used in the medical field for sterilization and disinfection purposes. Even swimming pools and drinking water can be disinfected using UV lighting. Tanning beds use black light to stimulate additional Vitamin D production in your skin, eventually creating that supposedly healthy glow. Or was that just back in the 70’s?
UV light is also used in art to create drawings visible only under UV lighting. Body fluids, such as blood, urine, and semen, are easier to detect under UV light. For this reason, UV lights are used in crime scene investigations. Have you ever seen a purple toilet? It’s so the staff can see where one has urinated over the edge.
See where this is going? Pet urine literally glows in the dark when exposed to the black light. Even long after urine has dried, its scent creating chemicals will still be visible even if the stain is hard to see. Thereby making pet urine stains including older dried urine easy to find. Black light is an easy pet urine detection device that anyone can use.
What kind of blacklight is used to detect cat urine and dog urine?
Many types of black light devices are available on the market with varying prices and sizes. The most popular come as a black light flashlight which use fluorescent UV bulbs and small LED lights.
An LED UV flashlight will outperform fluorescent lights. But you also need to take a look at the wavelengths your urine detector emits. Although light strength can vary from maker to maker, LED lamps are generally stronger and use less energy than a fluorescent type bulb. They are considerably stronger if you need to find dog or cat urine. By stronger we don’t mean the actual visible light which does not make cat urine glow, but rather the amount of UV light it emits.
The most important feature to look for in a urine detection UV flashlight is the wavelength in the description of the the particular UV flashlight that you are looking at. UV light wavelengths vary from 10 to 400 nm (nanometers, or billionths of a meter). A black light flashlight will be marked to indicate what wavelength they emit. You’ll most likely see an LED lamp powered UV flashlight with 400 nm, 385 nm, or 365 nm in the store. Try to avoid a UV flashlight with a wavelength of 395 or 400 nm. They are less useful in finding pet urine because they are emitting blacklight that is very close to visible light. For best results, we recommend going with a UV flashlight with 365 to 385 nm UV lights.
The number of LED bulbs also makes a difference in how easy it is to find pet urine. For household use you can easily go with 9 or 12 LED bulbs in a black light flashlight. As you can imagine, the more UV LED bulbs a UV flashlight has will increase the price. That said, it also makes finding that smelly stain easier.
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You can find blacklight lamps online. Click here to check out the PeeDar 2.0 UV flashlight we recommend and personally have from Amazon. Our favorite PeeDar 2.0 UV flashlight is compact, has 21 LEDs (yes, 21 !), and works perfectly every time. It’s really sturdy and even comes with 3 Alkaline batteries. We’ve dropped it far too many times to count and it just keeps working great.
A good quality black light UV flashlight with LEDs should cost no more than $20 to $30. This means that the technology is affordable as a household item. It’s not high-end technology that is only available to scientists. You can find cheaper ones too. But most of them perform poorly for urine detection because the UV light they emit is not optimal for finding pet urine. We’ve tried many as have our patients. That is why we recommend the the one we and many of our patients use, the PeeDar 2.0.
How does a blacklight help in finding cat urine and dog urine?
Now that you have the equipment aka “urine detector”, you are ready to find the dog or cat urine stain that is left on your floor, carpet, and furniture. It’s as simple as point and look but the following are a few tips to improve your search.
First thing to use is your nose. As a pet owner, you know that dog and cat urine smell very well, it’s pretty noticeable. So go to an area in your home where you smell the odor of dog or cat urine. Then use your urine detector to find the stain.
It will be easier to find the urine stains if you darken the room. Search in the evening or with the blinds closed, doors closed, and lights turned off. Dog and cat pee will still glow under UV in broad daylight. It’s just a little harder to find as you’ll have to point the UV blacklight right down onto the stain to notice it.
How do you find pet urine using a black light?
Turn the UV blacklight on and shine it on different surfaces. In general, if you are looking for house-soiling locations, you should look at all the horizontal surfaces, including bed sheets, furniture tops, bookshelves, your clothes, and even in sinks and bathtubs. For example if your cat is spraying urine, look on vertical surfaces as well. Especially near doorways, hallways, and corners. Find more about urine spraying here.
Turning on the black light the first time might be scary because everything may be glowing. Actually, there are several substances that glow when exposed to black light including some types of wallpaper glue.
All you have to do is determine whether what you are seeing looks like pet stains. Generally, you are looking for yellowish splatter, an individual urine spot, or drips. On vertical surfaces, you are likely to observe a single drop that has run down the wall before drying out. This video shows what urine looks like when viewed under a blacklight:
How to remove pet urine and stains
If your dog has been urinating in the house or your cat outside of the litter box for a while, you will see bright spots and weaker spots. The weaker spots are older and contain less of a concentration of chemicals that glow. That’s bad news for us because your pet is still able to smell where they peed or dribbled. That means they will continue to use that spot over and over.
Mark the locations where you find the dried urine stains as you won’t be able to see them when you turn the black light off. Anything will do, but we’ve found some Legos or other small objects work well to outline the area or mark the exact little spot.
Next, treat all the discovered locations with a cleaner intended for pet urine removal. We found Nature’s Miracle in the red and white spray bottle works wonders. It has enzymes to remove the proteins in the stains. It also helps remove the scent so your pet is less likely to “revisit” the same spot. We have bottles of this stuff at the office, in every exam room, and all over our house. It has a light scent and gets rid of that urine odor. Make sure to clean an area a little larger than the pee stain area you found with the blacklight flashlight. Find out how to clean pet urine here. First, doing so leaves no room for error. Second, pet urine tends to soak into surfaces (especially carpets), and what you see under a blacklight may just be the tip of the iceberg. If it’s on carpet, you may find that the padding underneath has also soaked up the urine.
Remember that knowing how to find pet urine is not the hardest part. Finding the dog or cat pee is just a single step along the path to making your house free of pet problems. For dogs, teaching them through positive reinforcement to urinate and poop where you want is the best course of action. You know known when they usually have to go, like right after they wake up or eat. Take them outside or where you want them to go. Teach them by giving them a command (we used “Get Busy” with ours). When they “do their business”, give them a treat and praise them lavishly. They’ll figure it out very quickly. If you would like additional help with a cat urine problem, please check out our article series about cat litter, litter boxes, and cat house-soiling problems here.
Now that you know how to use a blacklight for cat urine and dog pee, you are an expert pet urine detector. You can use your skills to find that smelly pee stain that you can’t see. Further, you know how to remove not only the stain but the scent so that your pet won’t continue to revisit the same spot. Lastly, we offered some tips for teaching your pet where to do their business. You’ll soon have a much nicer smelling home. Thus you will be happy and your pet will be happy. And keeping your Pet happy is what we all want.
