I just took my chuckwalla to the vet for a routine checkup (fecal exam, bloodwork, etc.) The vet mentioned that he has a nice, healthy build and wasn't too fat. He said he often sees overly fat lizards because they don't get enough room to exercise. In the wild, chuckwallas (and other lizards) regularly walk, run and climb. In captivity, space is often limited and so is their activity.

I'm sure that diet is a big factor, too, as the other folks were discussing. But if you have the ability, you might also consider giving your chuckwalla supervised access to a bigger area so that he can exercise.

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