I switched Cuddles up from hopper mice to rat fuzzys last feed day. She didn't seem to care but on the other hand she is a garbage disposal. She even eats in shed. I would make the switch ASAP. Mine just shed the other day as well, and she still hasn't pooped since I got her over a month ago and she has only peed 2 times. From what I have read this is normal due to growth. Cuddles now comes in at a whopping 107 grams at about 3 months old. Can't wait till she is in the 2000-3000 range. That's gonna be some big ol duces lol.