My neigbor is on vacation and his wifes sister is sitting his 2 dogs and has her own 2 dogs. Between the properties is a gate that my Heeler plays fence aggression with one of my neighbors dogs, harmless and we open the gate so they can play. The sisters two dogs are not getting along with my Border Collie and the Border Collie started joining in on the fence aggression with the other 4 dogs.
Today I let my dogs out and they ran to the gate. I am thinking no big deal but by the time I get to the (closed) gate my Border Collie has my Heeler pinned to the ground by the throat. I break it up and make sure my healer is okay and buttsore the Border Collie. An hour later it is like nothing happened. I know these things happen and are part of the way dogs are but my Heeler is old and not able to defend herself very well. Why a dog turns on its own pack when in this situation, I do not know. I have seen it many times but usually it is just a nip, not like today.