A. I would be concerned that there may be something beneath the third eyelid. I would recommend a veterinary visit so they can do an in depth eye exam. In my clinic I would do a stain to check for corneal ulcers or abrasions. Next I would look under the third eyelid. It may be treatable with an eye ointment.
A. If you mean your dog's 3rd eyelids are persistently elevated, this can be due to a number of conditions - dehydration (which occurs due to systemic fluid losses, through vomiting or diarrhea or loss of fluid into a body cavity), an injury to the eye that produces persistent pain and irritation, a condition called Horner's syndrome that affect the nerves of the head (and has it's own list of causes), a cancerous growth in the eye socket, etc. If it's been 7 days and it's progressing (as now both eyes are affected) I'd get this checked out right away.
A. It is important to get him a full physical exam and health check in order to assess both his eyes and any other internal problems which could be causing this. Systemic illness, thyroid disease and other debilitating conditions can cause this as can ocular disease or injury
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