Cold temps are here, and if your trail pal is a little light in the fur department, bundle him or her up with a Ruffwear Vert Jacket. It's got high-loft insulation for warmth, a waterproof shell to repel wet snow, and leg loops for a secure fit. A fur-resistant liner keeps the coat clean on the inside, and padded buckle pockets prevent uncomfortable abrasion. I've got a half-dozen Ruffwear coats & harnesses for my short-haired mongrel, and this one is both the warmest and the best fit. $85; ruffwear.com.