Protective Collar Sizing Chart

Collar Size  Neck Size  Finished Collar Size  Chain Size   Fits Most
xx small   6" -  8"  11" x 2.5 "  10" x 1.5 mm toy poodle,yorkie,chihuahua,chinese crested & similar
x small   8" - 10"  13" x 2.5"   12" x 2 mm maltese,shih tzu & similar 

small

 10" - 12"  15" x 3"   16" x 2 mm Miniature Poodle,Bischon, Min Pin & similar
medium  12" - 14"  19" x 3.5"   18" x 2.5 mm Boston Terrier, Pug & similar
large  14" - 16"  21" x 3.5"   21" x 2.5 mm Standard Poodles,Collies,Labradoodles
x large  16" - 18"  23" x 3.5"   23" x 2.5 mm Large Standard Poodles, Goldendoodles, Boxers, Great Danes