Who would you be working for as a veterinarian?

There are several options. The most common is, you would be working for another veterinarian who owned the clinic you worked at. Alternatively, you could be self-employed as the owner of your own clinic. Otherwise, veterinarians work in a variety of industries and government, at which point they work for whomever signs their paychecks (Federal government, private industry, military, NGO, consultant, etc.).