We purchased two Heated Wellness Sleeper Dog Beds in sizes Mini and Small; one for our small dog who tends to be cold and the other for our senior dog who struggles with arthritis. The beds have been a welcome relief to both dogs who use them routinely. The heat is enough to keep them comfortable without being too warm. The covers are durable and machine wash and dry frequently without pilling or shredding. The foam body is also durable; surprising so in light of the abuse the size small has sustained by repetitive scratching associated with nesting behavior of the older dog. We're very pleased with our purchase.