Big Barker builds orthopedic mattresses specifically for large and giant dogs. The XL headrest edition (about 52×36×7") uses multi-layer therapeutic foam that is marketed not to pancake, backed by a 10-year warranty and frequently cited University of Pennsylvania study data on joint comfort.
Choose this when budget Amazon couches keep collapsing under a Lab, Shepherd, Mastiff, or senior giant. It is overkill for toys and most small breeds — Big Barker sizes start in the large-dog range.
Measure shoulder height and compare to bed width; size up if your dog stretches fully side-to-side.