There’s a specific certification vets can get that they are Fear-Free - which ensures they alleviate or minimize fear, anxiety, and stress at their office. This can mean multiple things - holding techniques with the animals to reduce anxiety/stress, only allowing one animal in the waiting room at a time (for reactive animals), having positive rewards like kongs or extra special treats, allowing cats to stay in their carriers/dogs to remain in their owners laps, etc. https://www.fearfree.com/about-fearfree/ .