handling by others and vet
I'm an experienced dog owner (German Shepherds), but got my first Pitt/Lab mix from our shelter. He's been great with me and my other female dog. I've been working with an experienced trainer who uses positive training methods, and his leash agression has improved markedly, and no more lunging at cars, or bikers/joggers. He even goes into a total down when we're walking and only people pass by. (It's been alot of work, but totally worth it.) We're even doing some nosework. The problem is he seems to be less open to having someone other than me on his lead, and still lunges at new people. Obviously, I don't let strangers get close, and I manage greetings with a "let's say hi" exercise with the other person having an open hand, and that's it. But, it's become a problem at the vet because he's not allowing the vet to examine him or give him shots.
We're going to try some counter-conditioning, but I was wondering if others have experienced this and know that it can change. I'm by myself, so I need him to let others handle him for boarding when I travel etc. Right now I have a great pet sitter whom he trusts and is OK with. But, I need to have a back-up, and he needs to get his shots. And, let me add that this was his 3rd try at the vet (after being heavily sedated on 3 different meds)--and in a fear free facility, but it didn't work. Just looking for some encouragement and/or guidance if anyone had a similar situation. This one is new to me.