The dog is suffering from a partial or total loss of vision. This could be present from birth or happen suddenly due to injury or illness, or due to old age or diseases such as cataracts, retinal degeneration and glaucoma. If the dog has started bumping into objects, appears confused, reluctant, is easily startled, squints, rubs, or scratches the eyes often, or has a cloudy eyes or pupil or a tear, then he may be developing blindness.
