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.
A veterinarian and his or her team will look for all of the symptoms of a sick dog and determine what is wrong and how it can be treated. But what are the symptoms you need to look for at home? Depression: Not all dogs will act depressed when they are sick. In the wild, animals that act sick are more likely to die. Loss of appetite: Some dogs will miss a meal at times, and you should be aware if you have the type of dog that misses meals.