Miniature American Shepherd
The Miniature American Shepherd is a small herding breed developed in 1960s California from small Australian Shepherds. Compact but athletic, the MAS retains the intelligence, herding instinct, and versatility of its larger relative in a more portable package. They excel in agility, obedience, and as active family companions who adapt well to varied living situations.
12–15
years lifespan
20–40
lbs (male)
14–18
inches tall (male)
high
energy level
Temperament
How Old Is Your Miniature American Shepherd in Human Years?
Use our breed-specific calculator to find out, plus get personalised health and care guidance for your dog’s exact age.
Open Miniature American Shepherd Age CalculatorCommon Health Conditions
MDR1 Gene Mutation
Drug sensitivity mutation in ~50% of breed.
Typical onset: 0–1 years
Progressive Retinal Atrophy
Inherited retinal degeneration.
Typical onset: 3–7 years
Hip Dysplasia
~8% affected per OFA.
Typical onset: 1–4 years
Patellar Luxation
Kneecap displacement common in small/medium breeds.
Typical onset: 1–5 years
Lifespan Factors
The median lifespan for a Miniature American Shepherd is 13 years. Key factors that influence longevity:
- MDR1 gene
- eye diseases
- hip dysplasia
- epilepsy
When Is a Miniature American Shepherd Considered Senior?
Miniature American Shepherds are generally considered senior at around 8 years of age. At this point, you should increase vet visits to twice yearly and watch for age-related health changes.
Check your Miniature American Shepherd’s age in human years →