Australian Cattle Dog vs Whippet

This dog was bred to nip the heels of running cattle all day, and a bored, under-exercised Cattle Dog will redirect that instinct onto joggers, bicycles, other pets, and children's ankles — it is not a mellow companion breed no matter how it looks in photos.

A Whippet's skin is almost paper-thin with almost no fat or coat to protect it, so ordinary scrapes, thorny brush, or roughhousing that wouldn't mark a Labrador can tear it open — and its sighthound prey drive means it will not reliably come back if let off-leash in an unenclosed space, no matter how well trained, full stop.