my dog has been brought up with other dogs and used to live with a male dog and they were always playing and messing around with eachother. However i took her out today (im always hoping to bump into other owners with their dogs so she can play with them) and she came across a dog and they sniffed, chased eachother for a second before my dog turned and started growling and chased the other dog off whenever she came over, barking at her as she chased the dog off. Earlier aswell there were three small dogs and a puppy and she started growling and barking at them, eventhough she went over to them. Im quite confused as she loved playing and messing around with the male dog that used to live with us so i dont get it? Does she now hate other dogs?