The titanic kitty is looked after by Yulia Minina, who admits most strangers assume her pet is a dog.
She bought Kefir – named after a milk drink – nearly two years ago, and was told it was a Maine Coon kitten.
Kefir now tips the scales at 2st (12.5kg) and gives Yulia a big problem at night – it wants to lay on top of her.
She said: “When he was a kitten, it didn’t cause me any inconvenience but now he has become big and heavy – it is difficult to sleep.
“He is still considered a kitten.
Maine Coons grow up to three to four years. It should become even larger.”
Yulia, of the western Russia town of Stary Oskol, added: “He not only grew up big in appearance, he is also very smart and always behaves calmly. Kefir has a formidable appearance, but he is a very affectionate and modest child.”
Asked if Kefir is really as big as the photos indicate, she added: “I don’t use Photoshop.”