Unlike a country-wide system, Austria leaves dangerous-dog regulation to each of its nine Bundesländer individually, and the rules genuinely differ from state to state rather than being a shared national list with local tweaks. Vienna's own official guidance covers only Vienna's rules in detail, and its structure — a named breed list plus a licensing system — doesn't automatically describe what applies in, say, Vorarlberg or Tirol.

In Vienna specifically, the Wiener Hundeführscheinverordnung names a list of breeds — including the Bullterrier, Staffordshire Bull Terrier, American Staffordshire Terrier, Mastino Napoletano, Mastín Español, Fila Brasileiro, Mastiff, Bullmastiff, Tosa Inu, Pit Bull Terrier, Rottweiler and Dogo Argentino, plus crosses involving any of them — that must wear a muzzle and be kept on a leash in public places. Fully fenced dog zones are exempt, but unfenced off-leash dog run areas still require the muzzle.

Crucially for anyone just passing through, Vienna's own guidance states that the muzzle and leash obligation 'gelten auch für Personen die sich nur kurz in Wien aufhalten' — it applies to people only briefly staying in the city too, not just residents. The licensing exam (Hundeführschein) itself is framed around someone keeping the dog long-term, but a short-stay visitor with a listed breed should still expect the public muzzle-and-leash rule to apply from the moment they arrive.

Because the rules are genuinely state-specific, the only reliable approach for a cross-country trip is to check the rule for each state on your actual route rather than assuming Vienna's list (or any other single state's) covers the whole country — the oesterreich.gv.at portal publishes each state's page separately for exactly this reason.