Breeds

The following is a list of breeds where the Whitehead trait can be observed. 
List compiled by Corinne Benavides-Gyger

Herding Breeds

Australian Shepherd, Border Collie, Bearded Collie, Cardigan Welsh Corgi , Pembroke Welsh Corgi, Shetland Sheepdog, Old English Sheepdog, English Shepherd, Miniature American Shepherd

Livestock guardians and Mountain Dogs

Bernese Mt. Dog, Greater Swiss Mt. Dog, Saint Bernard

Terriers

Jack Russell Terrier, Fox Terrier, Bull Terrier

Bully Breeds

English Bulldog, Boston Terrier, Boxer, French Bulldog, American Staffordshire Terrier, Staffordshire Bull Terrier, Alapaha Blue Blood Bulldog, American Bulldog

Primitive Breeds

German Spitz Mittel, American Akita, Yakutian Laika, Icelandic Sheepdog, Finnish Lapphund, Karelian Bear Dog

Hunting Breeds

Beagle, Springer, Catahoula Leopard Dog, Basset Hound, Welsh Springer Spaniel, Spanish Water Dog

Toy Breeds

Tibetan Spaniel, Cavalier King Charles Spaniel, Chinese Crested, Papillon, Japanese Chin, Shih Tzu, Tibetan Terrier

Sighthounds

Ibizan hound, Whippet, Greyhound, Italian Greyhound