My husband and I are vegans but we do make that exception for our 2 dogs, cat and fish. It is better for them as far as I am concerned to not be changing there food. My dogs get little bits of veggies and fruit. I don't give them a lot because I am not sure on some fruits because of the acid content in some of them, and they get the runs if they get too much. My cat only eats olives.(only 1/2 of one) she cries and cries for one as soon as we take them out. Our fish get watermelon. Don't worry about the guilt factor about being veggie,(we did try them on a pure veggie dog food once but they wouldn't even touch it.)
Remember that you are doing a great job yourself and you should be proud of that. I had a hard time with it before but I know my dogs get ill when I change their food, so they are on the same stuff since they were pups. My cat won't touch anything but what I've been feeding her since a kitten - not even treats. Good luck in whatever you decide.
