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.
Night anxiety in dogs is a common malady. Your dog may bark, howl or show other nervous behavior when the lights go out. Take heart from knowing that you and your dog are not alone -- night anxiety is a common canine malady. Learn about its causes and how you can transform a panicked pup into a happy hound.