The Hidden Message Behind Your Pet's Tear Stains
(By Dr. Becker)
In August of this year, the FDA sent a letter of warning to three manufacturers of tearstain removal products.1 The reason? They contain the antibiotic tylosin tartrate, which is not approved for use in dogs or cats, or for the treatment of tearstain-related conditions.
The companies receiving the letters included the makers of Angels’ Eyes, Angels’ Glow, Pets’ Spark, and two exported products, Glow Groom and Health Glow. One or more of these products may be familiar to you if you’ve ever had a pet with tear staining – though you may not have been aware they contain an antibiotic.
The FDA has warned that if the products remain on the market, the agency may seize them or file an injunction against the manufacturers. Tylosin tartrate is approved by the FDA for use in livestock, but not in dogs and cats except when prescribed by a veterinarian. I think this is a good move (which is not a blanket endorsement of the FDA, by the way). I can’t imagine how these over-the-counter products containing tylosin tartrate have been sold under the radar for so long, especially since it is widely acknowledged that antibiotics are overused in the U.S., and antibiotic-resistant bacteria is a serious public health concern.
The company that makes Glow Groom and Health Glow actually admitted to FDA inspectors that they do not list tylosin tartrate on the labels of their exported products to avoid detection by customs in the countries receiving them.2
Tear Staining: What Is It? What Causes It?
Tear staining is usually caused by epiphora, which is the technical word for excessive tear production. The tearstains themselves are reddish-brown streaks under a dog’s (or cat’s) eyes. The condition is much more prevalent in certain breeds (for example, the Maltese, the Lhasa Apso, and the Shih Tzu), and is much more obvious in animals with light-colored coats. While tear staining is typically no more than a minor annoyance, it can also be a symptom of a serious eye health problem.
Medical causes of tear staining can include:
Infection of the eye
Unusually large tear glands
Unusually small tear duct openings
Glaucoma or another eye disease
Entropion (inverted eyelid)
Exposure to secondhand smoke
Plastic food bowls
Teething in puppies
If you have a dog or cat with tear staining, I recommend talking about it with your veterinarian at your next appointment. It’s important to rule out medical causes before you assume it’s a simple matter of too much tear production.
Why Some Pets Have or Show More Tear Staining
Tear stains are typically the result of porphyrins. Porphyrins are naturally occurring molecules containing iron – waste products from the breakdown of red blood cells -- and are mostly removed from the body in the usual way (in poop). However, in dogs and cats, porphyrin can also be excreted through tears, saliva, and urine.
When tears and saliva containing porphyrins sit on light-colored fur for any period of time, staining will occur. And if it seems your pet’s tearstains are worse after he’s been outside, you’re not imagining things. The iron-containing stains do indeed darken when exposed to sunlight.
Now, if the stains are more of a brown color than rust colored, it’s likely your pet has developed a yeast infection on her face because the fur under her eyes is constantly wet with tears. Brown stains from a yeast infection are different from red staining caused by porphyrins. This can be important to know if you’re trying to resolve brown stains with a product intended for red stains, or vice versa. Yeast infections are also odiferous, so if your pet’s face smells, think yeast. Pets can also have both a porphyrin stained face and a secondary yeast infection from the constantly moist skin.
To confuse matters further, currently, we can only guess at why some dogs make more porphyrin than others (and therefore have more tear staining). We can assume genetics and innate bacterial levels are involved, because certain breeds and lineages can be more prone to staining. But I have seen excessive porphyrin production in incredibly healthy animals eating a clean diet of organic, fresh food with no environmental toxin exposure (including vaccines). And I have seen the same amount of porphyrins in very unhealthy animals that I know are eating toxic food and living in toxic environments.
How to Treat Tearstains Safely
You can do a lot to control your pet’s tear staining by keeping his face meticulously clean and free of porphyrin-containing moisture. This means gently wiping his face at least twice a day with a soft, warm, damp cloth, keeping his face hair trimmed, and if necessary, making regular appointments with a groomer.
Hi, my name is Terry. I manage this website for my furbaby, Daisy. When I first became interested in the Shichons, I found it was difficult to get information on them. A few sites, I am using for information are excellent sources. Then, I moved on to compile and share more information on choosing a good breeder, grooming, health, behavior, training and much more. I hope you enjoy this site and find it helpful. I am NOT promoting any information, just sharing. You and your vet know what is best for your baby.