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.
It is normal when your dog drools at the sight of food. Drooling is also a normal reaction to stress for some pooches. Some dog breeds drool more because the breed has looser lips than other dog breeds. An over stimulated dog can start to drool suddenly. It could be the stress of being near the puppies of another dog. Some dogs drool when company arrives. On the more serious side of drooling, your dog could have dental or mouth problems. Other problems that can cause drooling include digestive problems, illness, allergic reaction or poisoning.