What are the common signs and symptoms of a spot in a dog's eye, and how should it be treated?

Common signs and symptoms of a spot in a dog's eye include redness, discharge, squinting, and sensitivity to light. It may also appear as a cloudy or opaque area on the eye. Treatment typically involves a visit to the veterinarian for a proper diagnosis and appropriate medication, which may include eye drops or ointments. In some cases, surgery may be necessary to remove the spot.