depends on the dog, I gave my last dog bed away as it sat in the kitchen and was tripped over for a couple years but never slept in by any dog
some times used to find things stolen from the bin in it but never saw any dog use it.
my husky sleeps on the floor mostly in the bathroom or kitchen as the lino is cool.
My shep sleeps on my bed
My Malinois will get on the bed for a while then curl up on the floor next to it
in my life of dogs i have had one or two that would use a bed teh rest slept on the floors or furnature