This is an unethical behavior that should be stopped and punished. Dogs and cats are both pets and should be treated equally. They should not be attacked or harmed because of their different sizes or personalities.
If your dog behaves this way, it needs to be trained and managed in time to prevent it from causing harm to other animals or people. If the cat is injured or dead, you should immediately take it to a pet hospital for treatment or treatment. At the same time, report the case to the local animal protection organization or law enforcement department, and hold the owner of the dog responsible responsible accountable. At the same time, it needs to be emphasized again that humans should respect and care for animals and must not kill them indiscriminately.