I really don't understand why anyone would become a vet. I love animals as much as the next person, which is why i don't understand why one would volunteer for

I really don't understand why anyone would become a vet. I love animals as much as the next person, which is why i don't understand why one would volunteer for this life. When having the cat put down, my first thought was for the cat and my personal sadness. My second thought was, wait, you folks do this for a living?