i cant say much for the brumation part because my tegus dont brumate (they are certainly healthy and still produce young) but i DEFINATELY agree that not having a BM for a week is strange. mine seem to poop too much haha. definately check your humidity level (could solve your shed issue) and certainly wanna make sure your temps are right. and just for curiosity what are you feeding your tegu? and how often?
hope we can help
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REAPER REPTILES

