Short answer: yes—leaving a dog in a car can be illegal in Australia if the animal is at risk, and that threshold is reached far quicker than you think.
Across all states and territories, animal welfare laws make it an offence to confine an animal in a vehicle where it’s likely to suffer heat stress or harm; penalties include hefty fines and, in serious cases, jail.
Even on a mild 22–25°C day, a parked car can rocket past 40°C within minutes; cracking a window does basically nothing.
If you spot a dog in distress, call 000; police or authorised officers (and the RSPCA) can lawfully force entry—random heroics with a window may land you in strife.
So yes, legally and morally, just don’t do it—take the dog with you or leave them at home with water and shade.

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