There are various reasons why dogs shed tears, whether it is a natural physiological response or a pathological health warning.
Physiologically speaking, when a dog’s eyes are stimulated by external factors such as dust, hair, or strong light, the lacrimal gland secretes tears for self-protection, which is similar to the mechanism of “crying in the wind” in humans. Some short nosed dog breeds, such as the Bago and Shih Tzu, have a special facial structure and a large curvature of the nasolacrimal duct, which makes it difficult to expel tears and often forms “tear marks”, resembling amber pearl chains around the corners of the eyes.
Pathological factors require more attention. Conjunctivitis can cause dogs’ eyes to turn red and congested, with a sudden increase in tear secretion, as if opening the door to emotions; Keratitis is accompanied by corneal opacity, and affected dogs may frequently blink and shed tears due to pain; Inverted eyelashes (endogenous eyelashes) are like tiny silver needles constantly rubbing against the eyeball, shedding “painful tears” with each blink. It is worth noting that ear canal infection, known as the ‘invisible pusher’, stimulates the lacrimal gland through neural reflexes, forming ‘distal tears’.
加えて, allergic reactions can cause tears and sneezing in dogs, like encountering an invisible pollen storm; In the early stages of systemic diseases such as canine distemper, tears may become a “warning signal” for the body; When malnourished, the cornea lacking vitamin A will become dry and cracked, and tears will become a “contradictory redemption”.
If your beloved dog is found to be continuously shedding tears accompanied by eyelid spasms, abnormal secretions, etc., it is recommended to seek medical attention in a timely manner and have a professional veterinarian perform fluorescence staining or tear testing, which is like doing a precise “CT scan” of the eyes.
