Can't remember which company it is (oh yeah, Purina, I think), but I do like the commercial with the dog running around the back yard with a hose in his mouth, spraying the heck out of his master.
The guy is laughing very genuinely as he tries to get away from the spray. Though running the whole time, the dog manages to keep the hose aimed right at him. It's SO cool.
Both he and his dog are having a fantastic time.