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Known Causes
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Small-breed dogs tend to have shallow tear ducts that are more prone to clogging. Some dogs' tear ducts don't open as they should. In those cases, surgery is required Sometimes the tear stains can come from an ear infection in your pet, even though it shows up in the animal's eyes. Your vet can prescribe an antibiotic if your dog has an infection.
Allergies can cause tearing in dogs, just as they do in people. Dogs are sometimes allergic to shampoos, certain types of dog food, and other allergens. Try a different shampoo and consult your vet about changing food.
Products available
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Tear stain removal products are available at many pet stores, online and through your local vet's office. Before using any product, consult your veterinarian to make sure you have done everything possible to stop the source of the tear stains. Your vet can recommend a product to treat the stains, and may even sell it in her office.
Home Remedies
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Ask your veterinarian to recommend home remedies. Some dog owners swear by using unscented baby wipes to remove stains, while others use purified water and a soft rag.
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Tear Stain Removal on Pets
Small dogs such as Malteses, Shih Tzus, Bichon Frises, Cocker Spaniels, Chihuahuas and Maltipoos are more likely to experience tear stains, which can be caused by genetics or diet. The tears stains can be irritating for dogs and can lead to infection.