Small amounts of discharge can accumulate on the inside aspect of the lower lid, similar to people. Clean any matter from the area around the eye. You can do this with a soft tissue moistened with water. Take special care not to use any chemicals around the eyes that could irritate or injure the eye.
Signs of "eye" problems include redness, excessive discharge, squinting or rubbing at the eye. If you see any of these signs, check with your veterinarian to help rule out any medical conditions that can be solved.