I agree, definitely be careful. My puppy is 8 months old and just got fixed recently so luckily he slowed down with that. We used to think it was funny when Duncan was little but as he got older and... more mature i guess.. it started to freak us out because "it" would get stuck out for like a lonnnng time (at least an hour until it went completely away
) and the poor thing would seem so uncomfortable.. he would just lay in a ball.. It was really scarey, you never realize how long an hour can seem until something like that happens- I'm sure that it was unusual for something like that to happen, but I doubt Duncan is the only one who that happened it. Knowing all this I'd say nip it in the bud and try to keep him from doing it too much/for too long...