My daughter and I went to a local GSD rescue and met a handsome young pup we'd like to rescue. The trainer kindly offered to bring him to our home so that he can meet my husband, son and our Husky this week. My concern is that he said the dog doesn't like to be rubbed/petted on this back as he seems to have some sensitivity (nerve sentivity?). The dog is 1-2 years old and is seemingly happy and spunky. I feel like I should be very concerned but no one at the rescue seemed concerned. Oh and I'll add that i don't think he's a purebred. He has a very different look. Thoughts? Thank you in advance for your help!