The Miniature Bed is a furniture item in Nintendogs + Cats that can be bought from Modo Home for $120 in all versions. It can be placed in one of the four corners of your home, and pets can sleep on it. For some reason,Basset Hounds seem to be very fond of this bed, and some spend most of their time on it.
In Toy Poodle & New Friends, it must be unlocked with 450 Owner Points or by playing 4 days.
In French Bulldog & New Friends, it is readily available.
In Golden Retriever & New Friends, it must be unlocked with 2,600 Owner Points or by playing 13 days.
3DS: "This comfy dog bed looks just like a human bed, but smaller!"