I love the tri boys
It's about 50/50. And, unlike in some breeds where certain lines may almost always free-whelp or need c-sec, bull terriers seem rather random. They can free whelp some litters and then the next time they can't seem to whelp them.
From what I've found most do at least need assistance in pulling them. In our case I had to keep them from slipping back up when she was between contractions by pressing from the outside. We also had to clean them because Casper just cared about the placentas at the time lol
@4ballz- Awww boston terriers seem like such wonderful little dogs.