They can do fine with small dogs, that said pits do tend to "arouse" faster and more likely to head for a fight at the drop of a hat and a doxie would not last long in a fight. On one of my pit forums that exact thing happened a couple weeks ago, the doxie snapped at the pit and the pit grabbed it and killed it. But that dog had shown desire to go after little dogs before too.

My female does well with smaller dogs, my male no way. Different levels of tolerance. Hard to tell how Magee would be, have you tried introducing them? Are they both males? How old is Magee?

I have a cat and the dogs would probably like to eat her but know it is not allowed, they are pretty trainable, I do not however leave them together unattended ever.