The dog upstairs has failed to communicate many times. What should I do?

First of all, you should try to communicate with the owner of the dog face to face, and don't lose sight of someone. Or ask the property management to help contact. Leaving a note is not a good idea. Face to face communication. If you think this person is ok, get along well, and he will be embarrassed himself. If others are wicked, you need to take some extreme measures. . But on the whole, it is better to get along well with neighbors. . .