Just remember, a lot of bearded dragons can carry coccidia. While it's not a problem for them, it can infect a chameleon. ALWAYS make sure that you wash your hands thoroughly with soap and water if you handle the dragon, and then are going to handle your cham. Don't let them "meet" - and keep everything separate. That being said, I've had my dragons for nearly 12 years, and they are in the same room as my chams. Their cage is perpendicular, so the chams can't see the dragons, but I've had all of them on our lanai for outdoors time with no issues. Be careful and you won't have any cross-contamination issues.