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My dog has one small, red eye and blinks constantly. What should I do?

Updated On September 23rd, 2025

One eye has become slightly smaller and he keeps blinking in that eye. It's comparatively red but not affected with bright light.

1 Answer

Most Helpful Answer

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Answered By Laura E. McRae

Veterinary Technician

Published on March 12th, 2015

I recommend having your pet's eyes examine ASAP. Your dog may have a condition called enophthalmos or sunken eye. This occurs when a retractor muscle spasms and pulls the eyeball back into its socket. When only one eye is affected, the most likely cause is a painful eye, often due to eyelid irritation, corneal abrasion or ulceration, or foreign material in the eye. Following a severe eye injury , the eye can also shrink and sink into its socket. Treatment is based on diagnosing the underlying cause of the sunken eye.

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