RED REINDEER DOG SWEATERRED REINDEER DOG SWEATER This beautiful sweater features a cute reindeer design on a red background. Chilly Dog Sweaters are the warmest dog sweaters out there. Dont let your dog be left out in the cold. Best of all,their sweaters are hand knit and 100% wool. The dyes used for the wool items come from plants and are totally natural. Because the natural wool is not treated with chemicals, the sweaters are both warm and dogs love them on their bodies.