Casual Canine® Irish Knit Sweaters are of the Highest Quality The natural heather pullover Irish Knit Sweater looks great on any dog, and is quite comfortable. Machine washable sweaters are made of soft, acrylic that will keep dogs toasty-warm, and features a chunky turtleneck and ribbed knit at the bottom for a great fit. Irish Knit Sweaters are available in the sizes listed below. X-Small fits up to 8" Small fits 8"-12" Medium fits 12"-16" Large fits 16"-20" X-Large fits 20"-24"