Large Ortho Thermo Bed Green. There is a K&H Ortho Thermo-Bed for all sizes of dogs. Its two layers of orthopedic foam are so thick and supportive that even the largest dogs will not bottom out. The unique dual thermostat maintains an even surface temperature of 12-15 degrees above ambient air temperature, to a cozy 102 degrees when in use. The heater is removable for washing. Recommended for indoor use.