the loose bloody stool is most likey from the food change or just all the shots, just like if we eat something or have something that makes us feel icky we get sick. They are just so tiny just a little grossness will go a long way.
Chewy has really bad food allergies and gets rashes when he gets into something *ANYTHING* he cants have even if it is as small as a peice of popcorn! and it can last for a few weeks
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hope that helped a little