I was spawning some pets to attach to a fence with a lead to test that feature out. When I used an Ocelot spawn egg, it spawned an adult as well as two kittens. Also, it appears that all three are moving super fast, even though only two of them are kittens.

EDIT: Sorry, that was wrong. I was just holding the mouse down too long. The real problem is that I can't tame the ocelots and they don't run away.