Best Answer: The pupil size limits the the amount of light that enters the eye. There are also day-time photoreceptors, the cones, which occur with three kinds of photo-sensitive pigments, for red, yellow-green, and blue.
Those âdevotedâ dogs lying on their mastersâ graves? Theyâre depressed. âMany dogs are simply depressed for their whole lives because theyâre deprived of the normal amount of attention, exercise, and stimulation they need from day one. These humans wonât know they have a problem and wonât want the dog any livelier as that wouldnât fit in with their lifestyle,â says Tamara.
Dog seizures may also occur if a dog has been poisoned - metaldehyde (snail bait) poisoning causes severe seizures in dogs. Viral or bacterial infections can cause inflammation of the brain and the membranes around it, and may also cause seizures, as well as general symptoms of illness such as lethargy, loss of appetite and possibly a fever.