Cartoons and Anime are two different things, a western animation that looks like it'd be considered an anime are only really anime-influenced animation and with anime, they usually start off as a manga. Plus, they people that work on the anime spends a lot of time with plot and character development. Japanese anime style has more of a realistic look in characters, where as in western animation, many physical features are exaggerated.
I really could go on about this but it's probably not needed, just look up how anime is different from cartoons and there will be about 42,500,000 results.