1. Reduce Disease: Neutering a cat can actually prevent many diseases, such as sexually transmitted diseases, prostate cysts, and uterine diseases. 2. Reduce the Chance of Losing Your Cat: Cat in estrus will be more like to go out to find their mating. And the chance of getting lost is relatively high. But neutering will reduce this responsiblity of getting lost. 3. Get rid of tension, irritability, and loss of appetite caused by estrus; And for male cats, it will also change the habit of pee everywhere casually at estrus period. 4. Control Fertility: If you let the cat breed freely, the number of homeless cat will increase accordingly. Many newborn kittens which are not properly handled will be homeless or end up with dead. Therefore, neutering can effectively reduce the number of stray cats.