I am not familiar with Dwarf Pyxies at all, so I'm afraid I can't help you with that. I wouldn't think they would be that different from a regular pyxie....hopefully John will see this and be able to respond.

I've never heard of a frog being allergic to the silicon, but it is possible. Was the tank freshly siliconed? I would try another tank with silicon and see if it happens again. Might be something else in that tank that us humans can't detect but your frog doesn't like. Best of luck. Do you have a pic of your dwarf? I am very curious about finding one for myself....