Bichon Frise has tear stains
Improper grooming: If the trimmed hair is left more on the head and face when the hair is trimmed, the hair around the eyes will irritate the eyes during the growth process, as well as the short hair left behind during the grooming process when the shaving is not clean and sticks into the eyes causing the dog to tear, over time tear marks will be left around the eyes.
Eye disease: Blocked nasolacrimal ducts are more common. This is because the nasolacrimal duct becomes inflamed and swollen due to infection, causing the entire duct to become completely or incompletely blocked, so tears cannot drain properly from the nasolacrimal duct and will naturally spill out, resulting in unsightly tear stains.
Inverted eyelid: This is also known as an inverted eyelash condition, which causes the eyelashes to irritate the cornea, making the dog’s eyes very uncomfortable and causing them to scratch their eyes with their forelimbs, which often results in a teary look and can also cause very serious tear stains.
Ear canal infections: Many people wonder what the tear stains in the eyes have to do with the ears, but they are very closely related, and this is the most common cause of tear stains in dogs. The most common reason for this is that the dog’s ear canal is infected with bacteria, viruses, molds, parasites, or swollen, painful, itchy ears, which can cause the dog to frequently scratch his ears with his hind feet.
Poor diet: Lack of vitamin C in the food and eating homemade foods that taste too salty can affect your dog’s eye health, and a poor diet can cause of tear stains.
Fire: If your dog has very yellow urine, is usually reluctant to drink water, and has runny eyes this is likely to be the cause.