A little disappointed with the thickness of this bed 'cos it certainly doesn't look or feel 3.5" thick.  Label says to give it 48 hrs at least for the foam bed to rebound after being compressed for shipment, but it's been a week, and there has been no further changes to the 2 dog beds we purchased. Both beds are at 3" max in thickness.  Foam is too soft for a large breed with joint issues.