We are very lucky to have two different vets with really great vets- overworked and hard to get an appt but great and caring vets -we are lucky. I do know some dogs really don't like shots and like some people over react to the them other dogs you could break a leg and they would just keep going-- but still I hope the know better as to where to inject a puppy and where not to. One of our vets is closed periodically for tech training so they are really good and the dogs like them.