I never really understood why MLP dragons ate gems. It's an interesting concept and I know it was a good way to avoid the omnivore situation in a world of herbivorous ponies, but dragon lore dictates that they hoard gems to protect the weak spots on their bellies, and I've never really heard of a dragon outside of MLP that eats gems. I'm just rambling and it's just a nitpick, nothing of great importance. (Being a Dragonology nerd I tend to overthink these kinds of things.)
This is extremely, extremely adorable! It's like, if I saw Spike tryna be a bad-ass and hurt me... I'd probably let him... It'd be to cute! (until I get outta the ER and my puncture wounds heal... a certain purple dragon will be on the back of milk cartons!)
Don't underestimate Spike. As adorable as I think he is, I would probably keep a safe distance if he started acting strange. He may be a baby, but he's still a killing machine with his claws, teeth and fire breath. He could probably hit hard too for human standards.