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.
If your dogâs constipation is not alleviated, obstipation-the inability to empty his colon on his own-can occur. In this state, the colon is packed with an uncomfortably large amount of feces, causing unproductive straining, lethargy, appetite loss and possibly even vomiting.here are various reasons why a dog may be constipated: 1  Too much or too little fiber in his diet. 2  Lack of exercise. 3  Blocked or abscessed anal sacs. 4  Enlarged prostate gland. 5  Excessive self-grooming can cause large amounts of hair to collect in the stool. 6  Matted hair around the anus from lack of grooming or from obesity.