December walks start in the dark and finish in it, and a short-coated dog standing about in that is genuinely cold rather than simply looking sorry for itself. A chunky knit does real work in those conditions. The roll neck is the part that matters most, because it covers the throat and the top of the chest, which is where a thin-coated dog sheds heat fastest while you are stopped talking to somebody at the corner.

It pulls on over the head and front legs, so there is nothing to fasten while your dog spins by the door, and the knit has enough stretch to move with the shoulders instead of pinning them back. The design carries a snowman, gingerbread men and cable-knit panels, in navy blue, red or green. Hand wash it and dry it flat: a chunky knit put through a machine comes out a size smaller and a different shape entirely.

• Chunky knit with a roll neck
• Snowman, gingerbread and cable-knit detail
• Three colours: navy blue, red and green
• Sizes S to XXL across fifteen variants
• Weight from 60g to 141g depending on size
• Hand wash and dry flat

On sizing: measure your dog's back length from the base of the neck to the base of the tail, and the chest just behind the front legs. Deep-chested breeds often need a size up from what the back length alone suggests.

What the options mean. Sizes run from M to XXL — £9.99 for the smallest, £12.99 for the largest.

Who it's for: Small and medium dogs with thin coats who feel December, and owners who want the photograph as well.