Hello all. i recently got a pittbull puppy he is nine and a half weeks old and has been living with me for 2 week. My roommate got a rottweiler puppy the day before yday and he is 10 weeks old. This is both of our first time with dogs as pets and i was wondering if the are playing to rough. They play around and grab at each others skin legs etc. with minimal growling from time to time. Is this bad should, are they to rough, will they be able to coexist? Thanks in advance.