I would think at any big chain pet store you should find a variety of collars. My only concern would be that she would think she could go out side and rub it on something to break off and this time it wouldn't break and she'd get stuck. I understand your frustration though. I finally gave up on the ferrets wearing collars...too expensive to keep them in it. I've seen a few different types of break away collars, some with velcro some with a buckle...have you tried another kind?