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.
Sleep is just as important in dogs as it is in humans because it keeps them healthy and restores their energy lost through the day. But a lot dogs have trouble sleeping at night. Senior dogs are the ones that are most likely to have dog sleeping problems, as their sleeping patterns get disrupted. Behavioral or medical causes are the two most likely reasons why your dog has sleeping problems.