Boxer dog collar, Large dog collar, Brown dog collar, Smart dog collar, boy dog collar, cute dog collar, Dog collar, cool dog collar, Adjustable collar, Unique dog collar, Handmade dog collar, stylish dog collar, Boxer Dog Pattern Large Dogs - Neck 16" to 26" All Collars can be altered to be smaller. 25mm Width All Collars can be altered to be smaller. If you want a collar in a bigger size check before placing an order. Since Dogs come in all shapes and sizes, we recommend you measure your pooch so you get the right size. We recommend you use a seamstress tape measure. If you don't have a seamstress measuring tape, mark the measurements on a piece of string and measure against a ruler or rigid measuring tape.