Holy fup, that looks painful. I heard that before, never take a dog walking in a field with cows, bullocks or rams. There was a little old lady killed over here a year or so ago after they charged her dog.
The bullocks did make 'false' charges but in the end they just wanted to sniff my lenses, the guy in the pic nearly did lick my forehead though when I was taking a close up. That was taken with a very wide lens so he literally was about 2 foot away :)