I recently took in a stray German Shepard mutt, she isn't even a year old. She is slightly hand shy, but very smart. Earlier, I had put a collar on her for the first time, and she wasn't having it. She didn't seem to mind it after a bit, but a minute ago, she knocked over the trash can to get a steak bone and I took it from her mouth and told her no. When she wouldn't move, I gently grabbed at her collar and she completely freaked! She whimpered and ran with her tail between her legs! I suspect this is from previous abuse. (When I first saw her, she ate like she had never eaten and like I said, she is super hand shy) any way I can get her to trust that I won't hurt her? She's very, very sweet. Laying next to me as I type this. Please help!