I’ve Just Rescued A Mom & Her 2 Pups. I Need To Crate Train Them But I Have No Idea How Big A Crate I Need.

This is not a large-breed dog. The mom is a Papillon mix and the dad was a medium-sized poodle-mix. I’ve allowed the pups and mom to have free reign of the apartment, with disasterous results. I love having them sleep in bed with me at night, but the “accidents” all over the apartment are horrid. Mom’s mostly house-trained. I just don’t always read her signals right. And I’m gone sometimes for hours at a time. I don’t want to put them in separate crates, but I don’t know what the best size would be. I also don’t have all that much room in my apartment for a huge crate either. HELP!!!