Dogs are obedient and loyal to their owners, but dogs seem to have a special requirement for their owners, that is, they hope their owners will love them. And when the owner prefers one to another in the distribution of affection, it will often cause the dog to become jealous of the favored person, and even fight as a result. This kind of jealousy is the most obvious emotional expression in dogs' psychological activities. Two external behavioral manifestations of this kind of jealousy are indifference to the owner, depression and aggression towards the favored person. In the dog family, the hierarchy formed due to fighting maintains the social order of the dog. It is the owner's freedom to pamper one of the dogs, but for the dog group, it is a fixed procedure, that is, only dogs with high status can be pampered by the owner. If a dog with a low status is pampered by its owner, other dogs, especially dogs with a higher status than this dog, will react and sometimes attack in groups. This is a manifestation of the dog’s jealousy. In the dog's psychology, every dog ​​hopes to be loved by its owner, and always wants to monopolize this love. Some psychologists also believe that this is a behavioral manifestation of the dog treating its owner as part of its territory. But no matter what, dogs always show an unhappy mood when their owners care about other dogs. This phenomenon is more obvious when the owner purchases a new dog. After a new puppy comes in, the original dog will always be unhappy for a long time, and may even threaten or bite the new dog. In view of this kind of psychology of dogs, we should pay attention to the process of contact with dogs. In front of our own dogs, we must not easily show obvious concern for other dogs and animals to avoid accidents. But taking advantage of the dog's jealousy, training dogs to pull sleds is very successful.