My neighbors have a puppy mill rescue dog and have had him for 3 months now, he is finally starting to warm up to her. My neighbors had to leave town for a few days and have asked me to watch their dogs. The puppy mill rescue is so timid and scared of me that he won’t come to me when called so he has to be on a leash when they go out, and he is scared of me that he won’t move and I have to slowly pick him up to get him back in the house. Usually I go slow with him and let him decide to go in the house on his own time, basically when he walks I walk. So my question is how do I how about taking care of him without making him terrified and setting him back with his trust issues. Also he won’t take treats from me in any way, by hand or off the floor. Any advice would be great.