I do more than half of my pet shopping at Amazon. The site carries so much variety in almost all the things my pets need. If there's something I'm not sure about, I depend on the reviews of other pet owners to steer me in the right direction. So, I did some searching on Amazon to find the highest ratings in 10 popular 'cat'egories to share with you. Here are what Amazon customers think are some of the best products for your cats.