Australian Shepherd
The Australian Shepherd is a high-energy herding breed that, despite its name, was developed in the American West. Valued by ranchers for their versatile herding ability, intelligence, and tireless work ethic, Aussies thrive with active owners who provide both physical and mental challenges. Their striking merle coats and bright eyes are breed hallmarks.
12–15
years lifespan
50–65
lbs (male)
20–23
inches tall (male)
very high
energy level
Temperament
How Old Is Your Australian 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 Australian Shepherd Age CalculatorCommon Health Conditions
MDR1 Gene Mutation
Mutation in the ABCB1 gene affecting the blood-brain barrier, present in approximately 50% of Australian Shepherds. Causes life-threatening sensitivity to common drugs including ivermectin, loperamide, and certain anesthetics. DNA testing is essential before any drug administration.
Typical onset: 0–1 years
Epilepsy
Idiopathic epilepsy with suspected genetic component. Seizures typically begin between 1-5 years of age. Australian Shepherds have one of the higher breed prevalences. Managed with anticonvulsant medication; most dogs achieve good seizure control.
Typical onset: 1–5 years
Hip Dysplasia
~8% affected per OFA.
Typical onset: 1–4 years
Collie Eye Anomaly (CEA)
Inherited developmental defect of the choroid and retina caused by a mutation on chromosome 37. Ranges from mild choroidal hypoplasia to severe retinal detachment. Present at birth and non-progressive in most cases. DNA test available.
Typical onset: 0–0.5 years
Hereditary Cataracts
Lens opacity hereditary in Aussies.
Typical onset: 2–7 years
Lifespan Factors
The median lifespan for a Australian Shepherd is 13 years. Key factors that influence longevity:
- epilepsy
- hip dysplasia
- MDR1 gene
- eye diseases
When Is a Australian Shepherd Considered Senior?
Australian 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 Australian Shepherd’s age in human years →