With regard to emotion, I think person has to bring their whole mind, body and spirit to anything they do. The veterinarians I know do that.
I will make mention that animal welfare is not necessarily trained into veterinarians in vet schools, which was really interesting to me when I started 10 years ago in this role.
There is a drive to bring more animal welfare science into veterinarian schools, so I will leave you with that: that we need to continue to increase in all people who work with animals an understanding of animal welfare.