Size Guide

Size Recommended For Example Breeds
 Small Small dogs (up to approx 10kg) and all cats

Toy Poodle, Pug, Silky Terrier, Pomeranian, Maltese, Chihuahua, Dachshund, Yorkshire Terrier, Shih Tzu, Cavalier King Charles Spaniel, Jack Russell

Medium Medium dogs (over 10kg)
Boxer, Bulldog, Border Collie, Cattle Dog, Kelpie, Siberian Husky, Australian Shepherd, Staffordshire Bull Terrier, Welsh Corgi, Chow Chow
Large Large dogs
Bernese Mountain Dog, Dalmation, Standard Poodle, German Shepherd, Rottweiler, Labrador, Doberman, Golden Retriever, Great Dane, Greyhound, English Mastiff, Ridgeback, Saint Bernard

 

Of course you are free to choose whatever size you wish!  

If you're looking for lightweight, then plastic tags are the most lightweight, and they are also very durable!  

The actual dimensions and weights of the tags are shown below.

SIZES & DIMENSIONS
  Small Medium Large
Width 20mm
0.8″
30mm
1.2″
38mm
1.5″
Height 20mm
0.8″
30mm
1.2″
38mm
1.5″
Weight 6.9g
0.2oz
16.1g
0.6oz
25.6g
0.9oz

 

ILLUSTRATIONS BELOW GIVES A VISUAL APPROXIMATION OF THE RELATIVE SIZES