The dog's stomach is very big, accounting for about 2/3 of the abdominal cavity, but its intestines are very short, accounting for about13 of the abdominal cavity. Therefore, dogs basically use their stomachs to digest food and absorb nutrients. It is easy to digest meat food, and it is difficult to digest things with "tendons" such as leaves and grass. Although dogs are carnivores, they can eat vegetables and grains when they are in trouble.
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Puppies and old dogs sleep longer, while puppies and strong dogs sleep shorter. Dogs are generally in a shallow sleep state, and they can wake up with a little movement, but there are also deep sleeps. When sleeping lightly, the dog is prone, with his head bent between his two front paws, often with one ear close to the ground.
Dogs are not easy to wake up after a deep sleep, and sometimes they talk in their dreams, such as barking and moaning, accompanied by convulsions of limbs and shaking of their heads and ears. When you sleep, you often lie on your side and spread out all over. It looks cheerful.