American Staffordshire Terrier vs Australian Shepherd

This breed carries some of the most restrictive breed-specific legislation of any dog worldwide — outright bans or ownership conditions exist in multiple countries and in various US cities and counties — and many landlords and home-insurance policies exclude the breed by name regardless of an individual dog's temperament or training.

Aussies were bred to work livestock all day and genuinely need a job — hours of real exercise and mental work, every day, for their whole life — and a meaningful share of the breed carries a gene (MDR1) that makes standard doses of common parasite-prevention and anesthesia drugs potentially toxic, which is worth knowing before any vet visit.