I don't know, but the answer is definitely more than two.
My son and I spent 20 minutes this morning trying to coax, finagle and ultimately force Calvin into his kennel before admitting defeat. Obviously Calvin was more committed to staying out than we were to getting him in.
Thankfully, we only live a mile and a half from the clinic. Nevertheless, by the time we arrived, my pants, my underwear, my legs, my purse and the car seat beneath us were all thoroughly soaked.