I have a 7 yo Patterdale who we got from a friend of a friends dad. Bad idea I know now.
We've had her for a year now and I really thought I was getting somewhere with her. We have been doing PAT with her as she was too snappy and barky at other dogs.
She slipped her harness today got her muzzle off and attacked another dog. Bit it in 4 places, the dog has had to stay in the vets overnight and it's coating us nearly 400 pounds.
I'm at the end of my tether, she had been so much better. She laid down and looked at me afterwards.
I absolutely adore her but I can't cope with this anymore 


Where do I go from here? She's had a vet check and nothing wrong, seen a behaviourist who said she wasn't aggressive. I'm a horrible d