You should totally be able to capture small non-aggressive animals, put them in a cage at the front of your vehicle, and use them as pressure-triggered mine detectors.
You run over a mine!
The squirrel blows up!
player backs away slowly from the minefield
Right now, if you manage to pasture a squirrel into your car, you probably just end up smashing it dead when you take off with the car. I don’t think you can get it to ride in the seats like a passenger. Although that would be pretty neat. Then I could make a seat in front, put a squirrel on it, and make it wear a motorcycle helmet.