I got a cat chia pet for Christmas, and was wondering if the grass it came with is actually safe? I know it says it is, but not everything is accurate. I think is wheat and oat grass, although I am not sure. It has not sprouted yet, so my babies haven't eaten any yet. Also, is the dirt it comes with safe? Gizmo has a tendency to eat soil/dirt. I would like to know if we should change the dirt when the grass dies, and we plant catnip instead.