At three times the size of the average cat, most would think that giant pet Rupert has done enough growing for now. But the super-sized feline, who at 9kg can claim to be one of the world's biggest cats, is only half grown and set to gain more weight, the Daily Mail reported.

A three-time cat of the year in his native Australia, Rupert is said by cat competition judges to be among the biggest Maine coon domestic cats they have ever seen.