A couple weeks ago I was doing some landings with a private pilot student when a fox ran out on the runway and just stood there. I grabbed the controls and jumped on the brakes. The student didn't see it until we were nearly stopped. The d*** fox just stood there and stared at us the whole time. Eventually it ran off back into the grass and out the airport fence. About two days later one walked right in front of us across the taxiway on our way out to the runway. Never seen any animals around GFK except the birds, who knows why there are foxes running around all of a sudden.