Why do dogs hide their mouths under their forelimbs when they sleep, and cats squeeze their ears under their forelimbs when they sleep? Animals use sensory organs to detect changes in the surrounding environment and respond differently to different changes. Dogs' sense of smell is particularly sensitive. To identify some objects, military dogs also rely on their sense of smell to judge hostility and identify paths. For a dog, its nose is the most valuable, so when it sleeps, hide its mouth and nose with its forelimbs to protect it, and use its nose to be alert to surrounding movement Once there is a situation, you can use your nose to identify it immediately, and you can also use screams to demonstrate. The cat's hearing is particularly sensitive. It uses hearing to detect changes in the surroundings. When it catches mice, it uses hearing to detect the location of the mouse. For example, its ears are the most precious, so when it sleeps, it squeezes the ears under the forelimbs to protect the ears on the one hand and stick the ears to the ground on the other hand, and once it hears the sound, it can take action immediately. After the human family, cats and dogs still maintain this sleeping position. The following options are correct for this text:. ['Cats are better than dogs in terms of hearing; dogs are better than cats in terms of smell.', 'Cats and dogs sleep differently, basically because they respond differently to different changes.', 'The unique sleeping position of cats and dogs helps to stay alert and protect your most valuable sensory organs.', 'Cats and dogs do not need to stay alert after entering the human family, but still maintain a special sleeping position.']