They don't get along with ALL my other pets... I have rodents. And a bird, chickens, etc. They would slurp them down as appetizers. They like the cats and dog though, they are convinced they are both dogs. I work with dogs and Douglas goes to work with me, my ferrets did too for a long time and they thought all the dogs were just the best things ever and had to be contained because they were just asking to get eaten.
I don't cage mine either, they have free roam of my bedroom and they sleep with me.
I have a video of one of my ferrets wrestling with a yorkie mix. Here it is-