MELBOURNE: A Maine Coon cat named Omar may take the title of world's longest domestic cat after Guinness World Records saw a picture of the feline on Instagram and contacted his owner.

Omar stretches out to 1.2 metres (47.2 inches) and weighs in at 14 kg (30.8 pounds), according to the cat's owner, Stephy Hirst, from Melbourne.

"We were expecting about a nine kilo cat," said Hirst, who told the Maroondah Leader that the Guinness World Records had reached out to her about Omar.

"He got to that before he was one-year-old and that's when we sort of realised that he's not nearly done yet."

The current record holder at 118.33 centimetres (46.6 inches) is Ludo, a Maine Coon cat living in the United Kingdom.

Omar eats dry cat food and kangaroo meat and has a relaxed life lounging around the house with dogs Rafiki and Penny, Hirst told Australia's Seven Network.

Guinness World Records has yet to confirm if Omar takes the title.

Maine Coons are one of the largest breeds of domesticated felines in the world. They derive their name from the US state, where it is the official state cat.