A Swedish family suffered the shock of a lifetime when they discovered that the 'kitchen mouse' that had their cat running around in circles was in fact a gigantic monster rat.
The Bengtsson-Korsås family first noticed something was wrong when their cat Enok refused to enter the kitchen in their flat in Solna, north-west Stockholm.
The rat measured 15 inches, without its tail, and had made it into the family’s flat by gnawing a tunnel between a wooden panel and concrete.

http://www.dailymail.co.uk/news/article-2589961/Monster-15-inch-rat-terrorises-Swedish-family-chewing-CONCRETE-wall-make-home-kitchen.html