I'm so sorry for your loss. What is it with theses dogs now a days? Especially ones that have been around
horses all their lives? My mother's boxer is becoming aggressive towards other dogs that pass her by, never used to be. She loved all the dogs in their neighborhood. I have 2 dogs and my brothers dog. His dog can't go near the horses because he will attack them, my little skipperkee/sheltie mix stays right with me and won't do anything except sniff them. My other dog tries to play with them while she's on her leash. We can't let her loose because she likes to run away. I'm sorry for your losses.