My staffordshire bull terrier is 5 months old and is alwaying peeing everywhere and even when people visit my home.

What should I do about this?

It could be a submissive pee. In which case, you can purchase a male diaper wrap to put on him so that way your home isn't ruined during this period. If it is submission, than everything that you are doing that is making him pee, continue doing it until he gets use to it.

At 5 months, little boy dogs are starting to become boy dogs. He is at a good age to get him neutered. Some boy puppies are more "manly" than others and he may be starting to mark his territory.

Another thing is he could be having a UTI. A vet check wouldn't be a bad thing with a behavior problem.