Petface Oxford Mattress Grey. The Petface Oxford Mattress is a super comfortable bed perfect for your favourite canine friend. With a large flat area to spread out on the Oxford Mattress will allow your dog to relax and sleep with warmth and complete security. With a super durable yet water-resistant outer fabric, the Oxford Mattress is complete with an anti-slip base and a zip at the side to remove the inner cushion for easy washing. What size is right for your dog? Size Breed Small Yorkshire Terrier, Pug, Chihuahua Medium Border Terrier, King Charles Spaniel Large Staffordshire Terrier, Springer Spaniel XLarge Collie, Labrador, Hungarian Vizsla XXLarge German Shepard, Boxer, Golden Retriever