Blue Tiger Print Martingale Training and Everyday Dog Collar 17-24" Ideal for large breeds. Boss Pet Products Blue Tiger Print Martingale Dog Collar has a fun tiger stripe pattern. This dog collar is ideal for large breeds, as well as dogs whose necks are as wide as their heads, such as greyhounds and whippets Constructed from single ply fray-resistant nylon and features a heavy duty chain Metal D-ring for attaching identification tags and a leash Built-in slide for fast adjustment on a squirmy pet Adjustable from 17" to 24"