We bought two collared lizards a while back, and "Jack" is losing extreme amounts of weight. He hasn't been growing very fast, this is especially sad because he was the larger of the two and now "Jill" is Huge compared to him. He's still eating pretty well, he ate fifteen small to medium crickets today with some chicken baby food. We've also been giving him some pedialyte in his water. But he seems to lose weight over night. Just yesterday he was starting to look much better, and now today he looks twice as bad. His hips are so sunk in, along with his legs and head. Just when he seems to be making a recovery, he starts losing weight again. He's so skinny and sickly now and we just don't know what to do. He used to be so energetic and lively and now he just hides all the time. Jill has been attacking him as well, could this be a cause? We're actually wondering if we have the two switched with their genders, because it looks like they're trying to mate. Jill viciously attacks his neck, Jack keeps trying to run away but Jill is so much bigger he has a hard time fighting back. He twitches his head like he's really hurt every time this happens and flinches if we go near his neck. He has become aggressive towards Jill lately and has been snapping back at her when she(maybe he) gets close. If you guys could offer any insight of why this is happening or what we can do to boost his weight we would greatly appreciate it.