Dogs have tear marks are which causes

There are many causes of tear stains in dogs, such as fire, blocked nasolacrimal ducts, and lacrimal gland infections. Dogs usually have too much fat and salt in their food, which causes the body to get on fire and thus tear stains. It is recommended to adjust the dog’s diet structure, keep the food light and provide enough drinking water. Blocked nasolacrimal ducts in dogs can also lead to tear stains, and it is recommended to go to the hospital immediately for unblocking. The dog’s tear ducts are infected, resulting in abnormal tear secretion, and it is recommended to consult a doctor for medication.