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.
One of the most common causes of this imbalance in a dog is a tumor of the pituitary gland or an enlargement of the pituitary gland. The name Cushing is given to this disease because of the increase in cortisone levels within the pituitary gland which result from the tumor.ne of the most common causes of this imbalance in a dog is a tumor of the pituitary gland or an enlargement of the pituitary gland. The name Cushing is given to this disease because of the increase in cortisone levels within the pituitary gland which result from the tumor.