When Beck Smith needs something done on her 53,000-hectare cattle station, all she has to say is "righto".

The farmer has trained her pack of working dogs, including sprightly three-year-old border collie Duke, to spring into action as soon as they hear that simple command.

"It's the magic word," Ms Smith told AAP from her property near Stonehenge in Queensland's channel country.

"If they hear that word, that means we're out of our pens, we're allowed off the car, we're allowed in the yards and we're allowed to go and do some work."

It appears to have done the trick for Duke, who has taken out a national working dog challenge by covering 556km during three weeks' work.

The good boy was on Monday crowned the winner of the Cobber Challenge , which uses GPS collars to track the distanc

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