I noticed a couple of days ago that my chin (Pika) is missing some fur. On each of his sides he is missing a big chunk of fur. I am the only one who handles him and I never grab at him (I always use a "scoop" motion to pick him up.) He hasn't lost any fur while I've held him, but I have noticed some some on his fleece liners. What would be the reason it's missing? Is he molting? I've had him since July 2010 and haven't seen this before.