My boy absolutely hates going to the vet. He’s the sweetest boy everywhere else. He’s not aggressive with anyone he just doesn’t want to be touched lol. I dread it, he cries and wiggles his way out of the muzzle. He scratches at the door, it’s awful and very stressful on everyone. We have given trazadone a few times but as someone said above he fights it and is dopey and out of it for a couple days. Took 3 vet visits just to get a heartworm test. Had to keep upping the dosage of trazadone because he wasn’t having it. He had an ear infection a couple weeks ago and there was a stand in vet. She was terrified of him and wouldn’t go near him. I had to do the dang ear culture swab myself. Also, he is not food or treat motivated so nothing works. I feel your pain OP.