My dogs eat a species appropropriate diet too.
I prefer Tom Lonsdale's (author of Raw Meaty Bones) approach, and do not feed the veggie slop. I don't give any supplements either. I will give them our leftovers, because we eat pretty well, but not in great quantity.
Basically, it is just raw meat and raw bones. Mostly the whole chicken, cut into parts, my guys haven't needed to see the vet for anything in the past 7 years but the legally required rabies shots.
I hope those 'left overs' do not contain onions.