You probably know that the fastest land animal is a species of cat, the cheetah. Talk of the cheetah’s amazing speed has to be accompanied by a disclaimer: very fast, but only for short distances.
Every cat, including your pet, is the same as the cheetah: made for fast sprints, not endurance over long distances. Some house cats can run thirty miles per hour—faster than you, probably, but you could outlast the cat, and so could a dog. A cat will literally overheat after a minute of running and will have to stop. Such is the nature of the cat’s muscle cells.