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Facts about Dogs 9
A dog has various ways of wagging their tails to indicate it's mood. A high, brisk, circular wag means excitement, while a low side-to-side was means "come no closer." A shivering wag with the tail tucked under the hind legs indicates fear or submission.
German shepherds are more prone to nearsightedness than other breeds; American cocker spaniels are more prone to glaucoma. Most dog vision problems are the result of too much inbreeding.
More facts about dogs
Dogs have only two kinds of color sensing cells, or cones in their eyes. The cones sense hues of yellow and blue the best. Dogs can detect red and green but, like a person with red-green color blindness, can't distinguish between them.
