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.
When a dog is anxious or stressed, he's likely to pace and whine or drool and pant. He's trying to express his anxiety and ask for comfort. If ignored, his anxiety can cause him to be destructive, such as tearing couch cushions apart, or harm himself, such as breaking off claws as he tries to dig out of his crate.