It may well be too late, but as others have said, your nose will be the biggest indicator.
Also, how the animal was laying may benefit as well, say if it was on its right side, gravity will send all the fluids & blood in that direction to settle & pool leaving the left or upper side somewhat drained and possibly fine, so definitely worth the time to do some investigating.
As an additional level of caution, consider when cooking any that you salvage, cooking it to well done if steaks or just grind it all into burger/sausage so it gets completely cooked all the way through.
Good luck, let us know what you decide and how it turns out!