I have a 10 month old pit mix. She eats cat poop when I let her outside. I want to let her out unattended but I have to be with her every minute she is outdoors. Of course the poop make her vomit and I'm tired of cleaning the mess in the house. I'm looking for a muzzle that she can't get off her head. The few I've tried, she manages to get them off her muzzle. Any ideas?