i have another pet tip, for all pets not just dogs: take them to the vet young and/or soon after you adopt them, BEFORE something is wrong with them. either book a basic wellness appt for checks (no shots or procedures) or just ask the vet if it's ok if you drop by with the pet either on leash or in a carrier and just get as far as the waiting room or outside the clinic if they're still doing COVID airlock protocols or busy. plan for this to take several hours. let the pet approach the vet office entrance and hear/see/smell the waiting room, windows into the room, the door, all the spots around the door, etc. engage positively with them if they're feeling interested, soothe them if they're nervous, and give high value treats if possible. maybe assign a super S tier treat JUST for the vet (bacon, shrimp, stinkiest cheese, whatever). feeding them can short circuit their anxiety loops (not all the time for every animal, but as a general guideline). even a single positive exposure to the vet office environment will help next time you bring them in. a treat jackpot for every time they act brave and explore further is a great technique
vet visits aren't just more pleasant when the pet is not freaking out, they're safer for the vet and safer for the pet, not just because animals injure themselves and humans when scared, but also because it's a lot harder to examine a panicky cat or aggressive dog. if your pet is sick and you bring it to the vet and the vet needs four techs just to restrain it to take a temperature, that vet is not going to be able to get a good observation of the symptoms. they won't be able to get a baseline blood pressure or heart rate. panic alone can kill small animals like rabbits and birds.
when you meet the nurse or tech or vet at an appointment, pass them some of the special treats and ask them to feed some to the animal if the animal is willing to take them and it doesn't interfere with the appointment. vets are usually able to spare a couple seconds to do this to make the visit easier and the next visit even easier. i did this for my dog and he thinks the vets are his best friends even though he's had multiple surgeries, vaccinations, exams where he was nervous or uncomfortable, etc.
not all animals can be acclimated to the vet but most can. in an emergency it can make a huge difference whether your pet is a behavior case when you bring them in to the office or not, which is not the vet's fault but a factor of animal behavior. you can plan for it and make it easier on yourself!
edit: buying a muzzle in your dog's size and getting him used to it is an even bigger bonus tip. vets will love you for this. even good dogs sometimes need a muzzle. pain and fear do weird things to animal behavior
