Collars

Classic Buckle

 Size (width) Fits Neck Size
 X-Large (1.5") 17 - 29 inches
 Large (1") 15 - 24 inches
 Medium (1") 12 - 19 inches
 Small (3/4") 10 - 15 inches
 X-Small (1/2") 7-11 inches
 Mini (3/8") 5 1/2 - 8 inches

Martingale

 Size (width) Fits Neck Size
 X-Large (1.5") 20 - 29 inches
 Large (1") 17 - 24 inches
 Medium (1") 14 - 18 inches
 Medium (3/4") 14 - 18 inches
 Small (3/4") 12 -15 inches

Bandanas

 Size Width Across Top
 X-Large 14.5 inches
 Large 12 inches
 Medium 9 inches
 Small 6 inches

Harnesses

 Size (width) Fits Girth
 X-Large (1" Width) 26 - 44 inches
 Large (1") 20 - 34 inches
 Medium (3/4") 18 - 28 inches
 Small (5/8") 12 - 20 inches
 Small (1/2") 12 - 20 inches
 X-Small (1/2") 10 - 16 inches
 Mini (3/8") 7 - 11 inches