Jasper had surgery on his elbows a few years back. Prior to having his surgery, he was always fine going to the vets.
His surgery was done at a vet specialist, and after the surgery he has never been comfortable on his trips to the vets.
I don't know if he had a bad experience, or just the entire experience was abit too difficult for him.
I take him monthly for Adequan injections, so I have to deal with it monthly.
Basically he is very nervous, he shakes alot, and is always looking in the direction of all noises (especially the door that leads to were he gets his shot).
I can understand that maybe its a pain association thing
, either way, I never pet him, or comfort him while he is in this state of mind.
I also don't let others pet him, or talk to him.
I do walk him back (instead of letting the vet tech), and I always ask them to just do their thing.
We did try a more positive approach with liver treats, however he won't eat them....
And petting him just stressed him out more, so that is why I take the approach I do.
I think the ones (dogs) that have a true fear, are just to smart for coexing, so I just try to utilize good energy (because they seem to pick up on it so easy), and walk him in, let the vet know I am there, and go sit down (I keep him next to me, with no petting or speaking to him), I won't reinforce his fearful anxiety.
I also don't give him any eye contact, they see through that as well (I think they pick up on our built up anxiety from knowing that our dog will have problems at the vets office).
Good luck to you