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.
There are numerous health causes of elderly dogs not wanting to eat. They can be cancerous tumors, infections, and many other reasons. Usually, what causes a dog to refuse eating is some type of discomfort or pain within their body. Dog depression or other behavioral causes might also be the root cause of the problem. When they get depressed because of a certain medical condition, they usually are not in the mood to eat, and thus turn the food down.