Hi! Our lovely lad is 20 weeks old and is an absolute dream. Sleeps through the night, no accidents in 10 weeks+ (touch wood!) and relatively easy to train (although we do use a dog trainer who is brilliant). He has play days with other puppies, with his trainer, and he is supervised. One thing is a bit odd: he doesn’t like rough play with other dogs (GSD or Golden Retriever). If they engage in rough play, he will play with them for a little time, but then leaves. His trainer says that he displays submissive behaviour (rolls on his back). He was not the biggest puppy in his litter but also was not the smallest (and when we observed him with his brothers and sisters, he was lively and rough playing with them). He prefers to play with smaller dogs and is really gentle (he likes frenchies and pugs). He’s a brave lad in general (happy walking on and off lead and will happily meet big dogs with mum and dad present). Has anyone else come across this? Is it a problem?