WHEN a cat runs, its legs are extended fully in the air, and then brought down and back. The cat’s extremely flexible spine allows its rear end to move, even while the forelimbs are on the ground. The cat moves faster by stretching its trunk fully, making the stride longer. The faster the kitty runs, the overlap between the left and right feet gets smaller. This makes the distance covered greater. At full speed, a domestic cat can be going as fast as 31 miles per hour.