Well,mash temps being a little below pasteurization temp of 160f might be cause for alarm if the thing carried botulism spores or something similar. So if you aren't using the spen grains,no worries. On the other hand,I dry spent grains in a 200F oven over several hours,turning once an hour to ensure even drying. So that would likely kill anything bad on that end of the process.
Boiling will kill most anything that could hurt you. Save for butulism. If I remember right,boiling kills the enzyme that can kill you,but not the spores. Not sure squirrels can carry that one & pass it on,just speculating.