Future Creatures: Leopard

My project is about how a leopard would evolve from what it is on this current day. The leopard would evolve in a way where its home would be turned into a desert with cacti and no water. It would also adapt so that it has teeth that can bite through cacti and can drink the water from inside and could eat the cacti too. The leopard would gain an extra tail because flies have quadrupled since the current day. It will also gain two more legs so that it can run faster and fend off predators in a better manner. That is my future creatures presentation, thank you.