Maybe the owners fear their pit bulls and don't trust them while they're sleeping. I have a two year old chocolate lab who has her own beds on each side of our bed. That way she can sleep next to whoever is home or whoever she feels closest to each night.
A neighbor boy named Jamie had a chocolate lab named Shaq. Jamie was about ten years old and the dog was older than that.
Shaq and Jamie were inseperable, they even slept together. Shaq went blind and Jamie would take him out for a walk every day with Shaq on a leash. My son and I were in the yard one day when they came by and my son called out “Here comes Shaq and his guide boy”. Jamie thought that was extremely funny.
Shaq died recently and I haven’t seen Jamie out lately but that may be because of the cold weather. No point to this story other than that boy really loved that dog.