LOL, I got mine....easy peasy...Fast travel to Falls End, go north out of town. On the left going north is a field with 2-4 cows in it, and sometimes a bull. Tell Peaches and Cheeseburger to kill the cows, once you loot them all, fast travel back to Falls End, which resets the field and repeat until you get your kills. Only issue is Peggies can travel the road just past the field if they are active in John's area and sometimes kill the cows...but basically took me less than 20 minutes to do this.
So remember...cows count as animals for this event.
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