RUGGED: Perfect for holding your Service Dog's ID Badge (ID Badge Sold Separately) DIMENSIONS: The window pocket is slightly larger than a credit card which is the same size as nearly all ID Cards sold. APPLICATION: Complete with a swivel snap hook that can be attached to your dogs collar, vest's D-Ring, harness, carrier or bag. EASY TO REACH IDENTIFICATION: This ID card holder will minimize confrontations when out in public as you will always have your identification handy. CLEAR MESSAGE: These clip on ID Holders are designed to inform the public that your dog is a service dog.