My dog loved the bed the minute we got it.  He is a 35lb Puggle who loves to sleep under the covers in the bed.  We have wanted him to sleep on the floor but I worried he would be cold.  This bed works exactly as designed.  He snuggles under the top layer and is nice and cozy.  When he gets warm he just lays on top.  He has a big attachment to the bed.  He bites onto it and lays on it for hours.