The Miniature American Shepherd, frequently abbreviated MAS, is a small herding dog breed.

The breed is often trained for dog sports such as herding, agility, obedience, canine freestyle, flyball, and others.

In 1993, MASCUSA (the original organisation) became the North American Miniature Australian Shepherd Club of America.

Working as a team with AKC and USASA, the name and breed of Miniature American Shepherd was born.

The Miniature American Shepherd Club of the USA achieved full AKC recognition and acceptance for the breed on July 1, 2015.

[4] Several chronic diseases and detrimental genetic traits are known to exist within the MAS gene pool, including progressive retinal atrophy (PRA-prcd), hereditary cataracts, iris coloboma, micropthalmia, multi-drug resistance gene (MDR1), hip dysplasia, and degenerative myelopathy.