Slumber Pet Memory Foam Rectangular Dog Bed Cover, 35" x 22" Chocolate and the bottom part is

and the bottom part is "D" Shape

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The Bauer Supreme Force Griptac Senior

Slumber Pet Memory Foam Rectangular Dog Bed Cover, 35" x 22" Chocolate and the bottom part isThe Slumber Pet Memory Foam Rectangular Dog Bed Cover, 35" x 22" Chocolate is a therapeutic memory foam dog bed that reduces symptoms of muscle and joint disorder. Innovative high density therapeutic memory foam beds conform automatically to dog exact weight and shape. A full 1 3 4 inch thick solid foam pad returns to its original shape indefinitely without flattening or bunching. Recommended by veterinarians for older or arthritic dog. Cushions