My bearded dragon won't eat.

Well I had to take that little guy back to my store :/ he still wanted nothing to do with food. He was getting pretty skinny too . I did however take home the bigger guy we had and he has already eaten me dry lol I will have to pick up a lot of crickets tomorrow because he is an eater. Hope they can get the other guy back to full health, was pretty down when i took him back to my store and she said he was in pretty bad shape. Plus side though this new guy looks like he will do just fine and that makes me happy.