Dog Head Collar Halter Red 6 Sizes Available in 6 sizes. Please use Sizing Chart for Size/Breed Reference, Snout and Neck circumference, and Loop size. SNOUT CIRCUMFERENCE SHOULD BE MEASURED 1.5-2 FROM THE TIP OF THE NOSE. IF IN DOUBT PLEASE SELECT SMALLER SIZE. For size XXL the Loop size is 11"-19", designed for snout circumference 14"-16". Nose strap layered with soft neoprene for added comfort. Strong and comfortable head halter is made of soft high quality 3/4" wide nylon. Easy to use well designed durable head collar provides control to stop jumping, lunging, pulling training Allows freedom to pant and yawn.