Animals have only a few 1 species or more developed taste buds. Therefore, animals' taste perception of food is more monotonous. For example, the cat's tongue can perceive the taste of bitterness, acid and salt, and is not sensitive to sweetness. So it doesn't like fruit. Dogs have a rather dull sense of taste. The perception of taste is extremely weak, but the smell can be used to judge whether the food is "delicious", so most dogs are not picky about food.