How to Measure Your Dogs Head for a Dog Helmet The opening (width) of the dog helmet measures as follows:
S: head circumference 10.3CM, 4 inch
M: head circumference 12.7CM, 5 inch
L: head circumference 15.3CM, 6 inch
Take a measuring tape and measure across the top of your dogs head from ear to ear (without bending the tape) - Order the size based on what inch mark is closest to the width of your dogs head from ear to ear.
NOTE:This item is sold as a novelty item only. Golonzo makes no warranties, express or implied, for its use as a safety device. This item is designed exclusively for dogs and has not been tested for a safety rating as established by the U.S. Department of Transportation or U.S. Consumer Product Safety Commission. The consumer is responsible for its proper use. Golonzo takes no responsibility for any injuries to your dog as a result of using this product. Rockstar Puppy reminds dog owners to always safely secure your dog in any moving vehicle.