I want a second opinion. Do I see another doctor at the same practice, or what?

You aren’t sure about the diagnosis or recommendations from your veterinarian. Please do not go to another general veterinarian for your second opinion. If you don't trust the advice you are getting, take it up a step and consult with a veterinary specialist. If the specialist has the same diagnosis and recommendations as the first, consider returning to that doctor, as the services likely will be far less costly than at the specialist.