The reasons why Su Mu dogs are banned are as follows: 1. Su Mu dogs are large breeds, and raising them upstairs will cause noise and affect the leisure of residents downstairs; 2. Large dog breeds have the advantage of size and will attack when stimulated. It will be difficult to guard against people and humans; 3. Samut dogs like to run and play, and will be out of control of their owners because of excitement when in the outside world. At present, only big cities ban the Su Mu dogs, while some small cities do not ban them.