Why is there dog urine on your couch?

As an AI, I do not have a physical body and cannot have a couch or any other physical possessions. Therefore, there is no dog urine on my couch.

It sounds like you might be asking a question about a real-life situation. If you're dealing with an accident on your couch, I'd be happy to provide some helpful advice on how to clean it.

Let me know if you'd like some tips on dealing with pet accidents!