I would think that sprinting would make it easier to bump into one, as well as making it worse - you'd knock over the cow, fall to the ground, then get trampled.

you obviously havn't pushed a cow yet

When I read that I got a picture of Scorpius from Farscape entering the room, doing his hiss/growl as that tail thing swished in behind him before walking into a cow...

Poor cow is gonna be put in the Aurora Chair.