What it is
Dogs have a third eyelid, a thin fold tucked into the inner corner of each eye, and at its base sits a gland that makes part of the tears. In a healthy eye a small band of connective tissue holds this gland in place. When that band is too weak, the gland slips over the edge of the third eyelid and shows as a red lump.
The weakness of that tissue is thought to be inborn, and the condition is linked to young age. Once the gland is out, it is exposed to air and rubbing, so it can swell further and make fewer tears, leaving the eye drier.
Day to day, the lump bothers a dog less than it looks, but an exposed gland is easily irritated, and rubbing with a paw or against furniture can damage it further. Over time a drier eye can turn red and sticky with discharge.
Signs you may notice
- Red lump in the inner eye corner
- Watery eye
- Red, irritated eye
- Rubs the eye with a paw
- Sticky discharge from the eye
A red, smooth, round lump suddenly appears in the inner corner of the eye, sometimes in one eye first and later in the other. The eye may water and look red, and the dog may rub it with a paw.
When to see a vet
Book a vet visit as soon as you notice a red lump in the corner of the eye, even if your dog seems untroubled. Go sooner if the eye becomes painful or cloudy, or your dog keeps it shut.
This is general information, not veterinary advice. For your own dog's health, tests and treatment, see a vet.