>>37653189I see them as metal-laced bones protruding from its skeleton. I always imagined Lucario has a metallic skeleton like Wolverine, hence the Steel typing. So the spikes may not be too easy to sand down or cut.
Regardless, I think you could hug a Lucario without doing anything to its spikes, as long as you're careful about it. And you could always cover them with something if you're worried about impaling yourself.