I have a 9 week old APBT and he is very sweet but our next door neighbors have one too (same age) and they play very rough together. At first we just thought it was puppy play when we first introduced them but, it is starting to get out of hand. They are playing TOO rough. To the point that they are badly getting hurt and they just keep going and won’t stop. They cross paths everyday since we are good friends with the owners but, I don’t want my dog to become aggressive. Any suggestions?