Jessica--I'm so sorry Buddy had to go back, but I believe your family made a wise decision. Why put the other 2 at risk?? When we got Riley, I refused to even take him into the house until my vet checked him out--I didn't have the room in an apartment to really leave him alone, so I just got to the vet first.
I'm sure little Buddy will find a great home, and in time, another dog will come along for you