Make Ocelots Stay Ocelots After They're Tamed

Somehow, when ocelots are tamed their color changes to make them look like domestic house cats. What makes it more odd, is that they're the only animals that do this; wolves don't become dogs after domestication, so why ocelots?

Different patterns would probably be enough to distinguish them. Though a little off topic, allowing collars to be used for ocelots would work even better.