Qantas will temporarily ban dog breeds prone to breathing problems from its flights and will then only allow boxers, bulldogs and pugs on board if a vet says they are safe to fly, after the death of two dogs last month.

In a case that grabbed headlines globally this week, Qantas passenger Kay Newman accused the airline of negligence in the death of her boxer on a flight from Sydney to Brisbane on December 19.

Duke the Boxer died while on a flight from Sydney to Brisbane. Credit:Facebook - Kay Newman

Another, Frank the bulldog, died on a flight from Sydney to Melbourne two days later.

Ms Newman said her dog Duke was left on the tarmac with no shade in 39-degree heat for more than an hour before the flight, which is what led to his untimely death, rather than respiratory issues known to affect the breed.