12 Was the most, when we had six of our own, four fosters, and I was babysitting my sister's two.Puppy party! For a few years, weusually maintained between 6 and 8 dogs at a time. I don't like to have one or two fosters at a time.
Again, they tend to be split up between caregivers. I've always had my two, plus my 1-2 fosters, and my parents' four.