Okay, if you had said either Halti or Gentle Leader, I would have known what you were talking about! The reason I asked about her build was that pitties and some other terriers have larger necks than heads, so collars slip off easily.

I would not, by the way, mention "pit" in your descriptions of her, I'd just say "Lab/terrier" or "Boxer/terrier" as that way, people won't be unnecessarily spooked by the "pitbull" reputation when you don't know for sure anyway. And a pittie IS a terrier, after all!