I purchased the new winter warm snuggle bed in medium for my dachshund who is 7kg. The bed is too small - as the sides taper down the usable space is in reality less than the measurements provided. She would definitely need a large, but the bed is also poor quality and not suitable as a proper bed and so I am returning it rather than exchanging. The base is a basic cushion and it feels unstable and insubstantial - it really is only suitable for use as an occasional day bed for a very light dog. I had high hopes for this bed and am disappointed, it feels cheaply made and does not reflect good value for money.