Usualy Howler is a Trap, that's easy to avoid. If triggered, it spawns an ICE directly behind it, but that's the problem: Between Howler and the spawned ICE the Runner can simply jack out and is done with it. I tried a little Double-Trap with a Whirlpool in front of the Howler. Keep a Janus or something else with high Damage-Potential in Hand or Archive and as long as the Runner has no fitting AI-Breaker, he can't avoid it.
Unfortunatly this Trap usualy works only once and takes some Effort to set up, because the Ices need to be placed in the right order, you need to have the right Ice to load ready and it only works in a Meta where AI-Breaker are not played so often.
But it's quite fun if you're able to fire it and it got my Howler out of the Binder for a Walk. ;)