What is excessive tearing in dogs?

Excessive tearing in dogs, also known as epiphora, occurs when there is an overflow of tears from the eyes. It is a common condition that affects many breeds of dogs and can be caused by a variety of factors. Dogs with excessive tearing may have a constant stream of tears running down their faces, and the fur around their eyes may become matted and discolored over time.

Anatomy of a dog’s tear ducts

A dog’s tear ducts are responsible for producing and draining tears. They consist of small openings in the corners of the eyes, which lead to the tear ducts and then drain into the nasal cavity. Dogs have a third eyelid, or nictitating membrane, which helps to protect and lubricate the eye. The tear film, which is made up of water, oils, and mucus, helps to keep the eye moist and free from debris.

Common causes of excessive tearing

Excessive tearing in dogs can be caused by a variety of factors, including allergies, infections, corneal ulcers, genetics, aging, and environmental irritants. Dogs with flat faces, such as Pugs and Bulldogs, are more prone to excessive tearing due to their shortened tear ducts. Other breeds, such as Cocker Spaniels and Shih Tzus, may develop hair growth around the eyes, which can lead to irritation and tear overflow. Environmental irritants, such as dust, smoke, and pollen, can also cause excessive tearing in dogs.