Ha, no clue. Is the Pit the dog who most likes small cuddly toys? If so, maybe the cat feels most welcome there. Or perhaps the Pit snores or farts or twitches less than the others, and is thus a more congenial sleeping companion.
—I don’t know how much I snore or fart (although I could tell you about DH, my bed partner), but our cat is paranoid about human twitchiness and being rolled over on during the night. Any movement at all wakes her up on full alert status. She won’t sleep down by our feet or under the covers like a normal cat. Instead, she wants to sleep up by our heads, which I guess are a bit more static.
After unsuccessfully battling this for several years, I gave up and moved our pillows out a bit to create a 12 inch gap we call the “kitty garage.” There she sleeps until she decides that it’s time for us to get up, at which point she climbs onto our shoulders or sides and gives us the Stare, very similar to Pat Summitt’s Stare, and equally effective.
Essentially, an 8-pound cat winds up sprawling in the center of the bed, pushing two humans with a combined weight that I won’t mention to the sides of the queen mattress, clinging to the edges lest we disturb the cat. And for those dog-owners who think this is ridiculous, you have no idea how persistent a cat is in winning nighttime battles. It’s a lot easier to surrender from the get-go than to try to tough it out and still lose in the end.