Our 75lb female Rottweiler LOVES this bed!!   As soon as we got it together she took ownership.  This is a size large and it just fits her perfectly.  She has had a knee surgery & is getting older and the memory foam is thick and condenses just the right amount so she get off & on easily yet doesn't squish down to nothing.  A little pricy (waited for a sale) hoping the cover will stand up well.