Inflammation in dog's eyes itself may also be a cause of "tear marks". In the dry and dusty environment, fine dust particles will irritate the dog's eyelids and eyeball mucosa for a long time, causing the dog to cry frequently and even form trachoma.

When the dog's nasolactic duct is infected and swells, causing the pipe to be blocked, and the cute tears cannot be discharged from the nasal duct normally, it will naturally overflow from the eyes, forming ugly tears. Over time, the brown tears on the hair will be very obvious. Therefore, parents must regularly perform health checks on their dogs to eliminate hidden dangers.

Tears are inherited, which is probably a knowledge point that the parents of Meng Wang don’t know. There is an underlying condition called primary tear hypersensitivity, which is a hereditary disease. Dogs suffering from this disease often have excessive secretion of tears, which can easily cause "tear stains". When the crying phenomenon is inevitable, parents can use cotton swabs to dip their saline water to clean the dogs.