Around the Collar Sizing Guide:

 
The adjustable length shown is the distance around the collar from the minimum to maximum adjustment.
 

Standard Collar:

Size Width Adjustable Length
XSmall 1/2" 6" to 8"
Small 5/8" 8" to 12"
Medium 3/4" 14" to 16"
Large 1" 18"+
 

Swarovski Stones / Hemp collar:

 
Size Width Adjustable Length
Teacup 5/8" / 1" 6" to 8"
XXSmall 5/8" / 1" 8" to 10"
XSmall 5/8" / 1" 10" to 12"
Small 5/8" / 1" 12" to 14"
Small/Medium 5/8" / 1" 14" to 16"
Medium 5/8" / 1" 16" to 18"
Large 5/8" / 1" 18" to 20"
XLarge 5/8" / 1" 20" to 22"
XXLarge 5/8" / 1" 22" to 24"
 

Step- In Harness:

 
Size Neck Girth
Teacup 7" to 8 1/2" 10" to 12"
XXSmall 8 1/2" to 10" 12" to 14"
XSmall 11" to 13" 15" to 17"
Small 14" to 16 1/2" 18" to 20 1/2"
Medium 16" to 19" 20" to 23"
Large 19" to 22" 23" to 27"
XLarge 22" to 25" 27" to 30"

If you are not sure, please call us at 877-800-8181 to speak to a customer service representative.