peanut (chihuahua puppy) has always been super duper submissive towards all people, and decently submissive to dogs. lately, though, he's started peeing whenever it's time to go potty / outside. it's really annoying b/c he never does it when it's time to go to bed, etc, it's JUST when it's time to go potty. he also flips over on his back every time someone approaches him, but it seems to be getting more frequent now that he pees on himself. it doesn't matter if it's been 5 minutes or 5 hours since he's been outside, he does it every time! he just looks at you, flips over and covers himself from head to toe in pee. we don't make a big deal out of going outside, we don't even have any word that we say every time. he just knows. any help would be appreciated, i'd really like this to stop!