Collar not included. Dog bandana available in sizes S-XL. Small neck size 8-14 inches (mini Dachshund, Yorkies, mini Schnauzer, Chihuahua) Medium neck size 14-20” (Beagle, Cocker Spaniel, Bulldog) Large neck size 15-26” (Boxer, Labrador Retriever, Dalmatian, German Shepherd) X-Large neck size 16-28” (St. Bernard, Mastiff) Select the size at checkout. https://www.etsy.com/listing/1674302205/acdc-dog-bandana-thunderstruck-gray