Burst, emptied and flushed out an abcess on a cow's hip.
Basically a huge spot filled with two litres of lumpy, liquified flesh and pus, which I then washed out with a garden hose.
Oh and removed many cases of 'retained afterbirth' in cows - that's where the placenta doesn't let go, so the whole thing sits there until it's gone off sufficiently that it comes out with a tug. That is the definition of stench.