NO PITTS!
I have a border collie, a cattle dog, a jrt, and a chihuahua. all girls. all fixed.
the new doggie is a hundred pound chocolate lab, male, intact. he's older, so I don't think there will be a dominance issue. he seems to be a fat, laid back, old man. but...he's MASSIVE.
so a spotter is definitely needed. if only to keep my nerves calm, so I don't transfer negative energy.