1" Width BioThane® Martingale Collars Collar Size:18-23" These Fi 3/3+ compatible collars

These Fi 3/3+ compatible collars are made in either the "overlay" fi style or "in-line" fi style

The Series 3+ will still work with the overlay design for GPS tracking and fitness

you can purchase one HERE

These harnesses are lightweight

can chip/wear overtime

1" Width BioThane® Martingale Collars Collar Size:18-23" These Fi 3/3+ compatible collarsMartingale collars are specifically designed to provide more control than a standard collar & (when fitted properly) will prevent your dog from escaping or backing out of their collar due to the cinching function. While martingale collars don't prevent pulling, they are an excellent training tool for teaching your dog good leash manners. They are highly recommended by trainers as the go to collar choice. Please be sure to follow our "how to measure"