Do wolf pups spawned in creative mode grow up?

[FennecFyre]

Dumb newbie question, I recently bought the game and have been loving it, but I wanted to try out a mod that allowed wolf pups to be tamed. I found a wild, naturally-spawned pup and kidnapped adopted it, but as soon as I let it out of its cage (from another mod, this wasn't one bought from a trader) it almost immediately grew up into an adult and tried to kill me. Once I got that one out of my house I went into creative and spawned a wolf pup manually just to see if it would happen again, but this one, once released, didn't grow up. I ended up taming that one, but it's been a pup for a while now. Do creative-spawned pups grow up, or are they stuck as babies forever?

[Bumber]

They take 336 hours (14 days) to grow up after spawning. The natural pup must have been around for a while before you caged it.