River Ridge Leather Dog Collars are handmade from high quality, oil-tanned Latigo leather for very high tensile strength. Latigo is a 100% natural, traditional leather tanning process that produces very strong harness leather with no impregnated toxins or heavy metals to come into contact with your dog's fur and skin. Dog Collars are measured end to end. Dog Collars need to be 4 or 5 inches larger than the dogs neck.