My name is Patricia. I'm a hobby dog ​​handler. I have a rescue dog, Milva, who will be three years old soon. She's always been a cautious dog. We used to play food games together, and it worked quite well. A few weeks ago, I offered her some food. When her muzzle was still about half a net away from my hand, she suddenly yelped. I couldn't see what had triggered it. It took a while before she would even take food from my hand again. Now, the food games are very tentative. You'd think she was being beaten. Any idea to fix it