There are no standard collar sizes so please measure your dog before ordering to ensure the collar fits.
To Measure - Measure your pup's neck with a soft tape measure, pulling the tape snug but not tight (if you don't have a tape measure, use a piece of string and then measure the string with a ruler). Allow sufficient room to slip two fingers between the collar and your pup's neck.

MARTINGALE COLLAR SIZES

 Neck Circumference Collar Width
S 10-15" 1/2"
M 13-21" 3/4"
L 15-25" 1"

 

LEASH SIZES

 Leash Small Large
Length 5 feet 5 feet
Width 1/2" 1"