Yeah, the urination mught be funny if it didn't happen every 10 seconds. It's especially annoying if you don't unsummon it before talking to someone, because the thing pees like 5 or 6 times per average conversation.
It was amusing the first time, but it happens a bit too much.
I don't have the creature's problem... but hearing that sound.. makes me need to go nearly as much as it does.
So yes, I think it's a tad excessive. Kinda like the dialog that tells you that a quicksave was loaded. I think it's a mistake that made it into the final game.