I was trying to get my dog upstairs yesterday and she wasn't listening so I was trying to manouver her with my hands to go up we got to the top of the stairs (with trouble all the way up) and all of a sudden out of no where Ivy comes running up the stairs so fast and leaps onto my dogs back and starts attacking her! I pulled him of her and he was hissing and trying to claw her as I held him back. Before all this happened he was sleeping on the couch.
I guess he thought she was giving me trouble and decided he needed to sort her out
Needless to say I think the dog is afraid of him now.