Why Choose Onarway Dog Bed? ?Designed to Provide a Comfortable Sleep? ?Sturdy and Durable Memory Foam Dog Bed? ?Skin-Friendly Soft Breathable Material? ?Anti-Slip Bottom? ?Easy to Clean? ?Available for All Seasons?Please Measure the bottom of the neck to the base of the tail of the dog (see image 2) to choose the correct size. ?Size M: 60 x 50 x 20 cm?Suitable for the dog back dimension from 25 cm to 38 cm ?Size L: 75 x 62 x 25 cm?Suitable for the dog back dimension from 38 cm to 55 cm ?Size XL: 90 x 68 x 26 cm?Suitable for the dog back dimension from 55 cm to 73 cm