- All dogs produce “sleep” in their corner of the eye that forms a crust as they sleep. Some dogs just produce more than others.
- Allergies that cause conjunctivitis can cause a runny eye.
- A foreign body or trauma to the eye can cause tears and phlegm to form.
- A bacterial infection can cause puss to form in the eye.
- A viral infection such as canine distemper can cause ulcers to form on the eye.
- Dry eye, glaucoma, and some types of cancer can cause phlegm in the eye.
Recommendations:
- If your dog is scratching at their eye or holding their eye closed go to the vet.
- If you see a lot of phlegm or a bloody discharge go to the vet.
- If the eye looks odd, red, cloudy or ulcerated go to the vet.
- If the dog seems painful or depressed go to the vet.
- If your dog just has normal sleep in the corner of its eye, a warm cloth gently wiped across the eye to clean it.