u/TooManyMonkeyBrains

We have a 4yr 100lbs Irish wolfhound neutered male and a 15yr 40 pound collie mix female. Second fight, 1st was over a dead ground hound no blood drawn, this time puncture wounds across the throat and face. Pretty sure he would have killed her if we weren't outside.

He's always been a nervous dog which we've done behavior training. But this resource guarding aggression is escalating. We don't want a dead dog in the yard or worse a child. Is he too far gone? He's usually the perfect big dumb sweet dog. It's killing us this is happening.