How many sizes is the pet bed available in? Layla January 10, 2020 16:08 Follow Three! Small, Medium and Large. Related articles How do I clean the pet bed? Will the adjustable base fit inside my existing bed (Headboard, Footboard & Rails)? Can I use a mattress protector with the topper? What is the Layla Pillow? What is the Layla Mattress 120 Night Trial? Comments 0 comments Please sign in to leave a comment.