My son has had a bearded dragon 18 months now, he ( the lizard) is a big, active guy. Loves to eat, loves to roam the house and climb and things, all the normal stuff. Just...never poops? I mean, when he goes, it's a memorable thing, but it just seems like he should go more. So, how often should expect him to poo? I mean, he can go a couple weeks, never lethargic or anything. T thought they went more often than he does.