San Francisco 49ers Dog Jersey Size Large Officially Licensed by the NFL - San Francisco 49ers Dog Jersey Constructed of Breathable Micro-Mesh Polyester Features Official Team Number Font and Embroidered Logo on Sleeve Stylish V-Neck Cut Allows for a Comfortable Fit Small fits Nape of Neck to Base of Tail 12" - 16"; Girth 12" - 16"; Neck 6" - 10".