Well, you can be pretty positive it wasn't that squirrel. I am SafeServe certified and you can leave pretty much anything out for up to 4 hours without any issue. It also takes typically 15 hours for enough bacteria from bad food to develope in the gut and cause illness. That being said, there are other things like allergies, bites etc. that can cause reactions much more quickly. When I warm weather hunt, I never worried about field dressing squirrels. I often would bring home my limit and then stop by the trash heap on the way to the house and make quick work of them. If you are going to field dress them, you will definitely release a lot more blood scent and if you are around wolves, probably attract them more. One thought you might try would be to carry them in a rubber lined laundry type bag, to avoid dripping blood as you're walking around. We don't have wolves here to worry about, so that's the extent of my thoughts on it. More than likely though, if you did have food issues it was from 1 to 4 days previously.