So last night I took my dogs out , as I usually do after I get off work. I have a blue heeler and a dingo mix . Both usually fine. We had to get a shock collar for pulling for the blue heeler because he pulled me down the steps before I was pregnant , and the collar usually works. Last night , idk what happened with him but he yanked and pulled and bit my other dog because he was getting shocked because he was pulling me too hard and we got to the dog park he knocked me down and wouldn’t let go of the leash and was tugging me through the dog park. I couldn’t let go because my hand was wrapped in the leash. He’s not normally like this but idk what to do with him. Any advice?