Hello. I'm new to the forum. I have a strange scenario which occurs when my daughter brings her two 8 month old adorable staffy pups to my house. I have two dogs - a 4 year old Bull Arab (Penny) and a 5 year old Ridgeback cross (Ella), both of which are very friendly. I will describe the problem. Sometimes they play okay - lots of submission by the puppies but Penny has suddenly started getting quite aggressive with Ella when Ella is playing with the pups. Penny is not aggressive towards the pups - bit domineering but nevertheless she doesn't hurt them. I had to turn the hose on my two adult dogs today when Penny starting getting into Ella. I am at a complete loss as to why she is doing this. Is it because she is perhaps jealous.... or maybe she thinks Ella is hurting the puppies.... or am I way off the beaten track. If anyone can give me any clues about this behaviour, then I will be better equipped to deal with the next visit.