i have a 5 1/2 month old olde english bulldogge and lately he has been offering up his back-side shortly after he and another dog begin sniffing each other. he also has tendencies to lay spread eagle on his back. i know this can be a dominant/submissive thing but he is 50+ pounds and he has a friend accross the street, a 4 pound bichon/poodle who's roughly the same age, whom even when playing as gentle as a pup possibly can, he still pounds this other dog in a non-aggressive but very dominant puppy rough housing way. and then when he's tired of playing, they begin the siffing ritual and my pup will turn his butt to the other dog as if saying "all aboard". he's started this behavior with random other dogs as well and i don't like it. i'm beginning to worry that this will be a regular thing which will make it difficult to take him to dog parks and other off-leash places and this really bothers me because he has really taken to loose leash and off leash walks. does anyone have any suggestions as to what i can do to stop this behavior?