My dog, sometimes suddenly appears particularly excited and runs around the house. What happened?

It is the nature of dogs to have fun, especially for young dogs. As they get older, older dogs like to be quiet. The excitement of dogs is very special. Just give it a hint and it will run and jump. This is the normal state of dogs. If the dog doesn't want to move or even tease it, it's in trouble. Maybe there is something wrong with the dog. It is necessary to keep the dog excited.