Hi! I have a 16 week old Labrador puppy (male) and my Mum has his brother, from the same litter. I do not live with my Mum so the puppies do not live together but we would like to be able to spend time with them together/bring the puppies to each other’s houses, go on walks etc. HOWEVER, whenever they are put together they fight CONSTANTLY - no breaks at all unless we separate them and put them in different rooms. Initially it looks like play fighting but there has been a couple of occasions where they have been play fighting and then become serious with hackles raised and firm lip growling. We try to leave them to it as long as they are not hurting each other but they DO NOT stop or take any real breaks - what can we do about this? We are supposed to all be spending Christmas together and it would be nice to have them co-existing in the same room without jumping all over each other! Help!