This is a new one for me, hopefully someone can advise. My Murphy, PWC, 27 lbs, 14 months, AKA Mr. Happy Friendly Mellow, Loves all Living Things had a houseguest, Charlie the 10 lb. girl poodle, 7 years, also very happy and mellow. All was great for 4 days, lots of playing, barking, frapping, etc. Last night i was on the couch with doggy treats, and gave one to each dog on each side of me. Charlie the poodle ate hers too quickly and started making the "hork gack hork gack" noise. In the blink of any eye, Mr. Mellow Murphy had bared his fangs and was viciously attacking her neck and face, accompanied by lots of growling and barking and snapping. Charlie snapped back, and i had to use both hands and all my strength to pull Murphy off her. A couple minutes later, all was fine and they were frapping joyously through the house. What the heck was that? I really think he would have done her harm if i hadn't intervened. Is there some natural predator that "horks" that stimulated his predatory response? It freaked me out and now I'm not giving them any treats for the rest of eternity! Any ideas for me?