They are perfectionists 

Many vets are perfectionists, which means that they will always try their best to save your beloved furry friend. So, you should thank them for that. Sadly, saving animals can require a lot of resources, such as financial and time concerns and vets can’t do as much as they would like to do for these poor animals, so it can be frustrating for them. 

“I don’t know any non-perfectionist veterinarians. I’m sure they’re out there. I just don’t know them,” says Loenser. “You have these really highly intelligent people, driven people who are perfectionists who want to solve problems and heal everybody. It’s a tough job,” says Del Moro. “So many times our minds are the biggest problems that get in the way.”