I was just thinking and packs of roving wolves running around killing livestock and people would just be awesome. Could you imagine walking out of your house and having a semicircle of wolves pounce on you? I wouldn't even be mad, I'd think "This game fucking rocks."
Seriously though. Wolf packs.
You're just innocently working on your farm and BAM, flying out of the side of your screen twelve pissed off dogs decide you're the next meal.
Not to mention attacking chicken coops, your cows/sheep... and if you can tame one, you could have a shepherd dog that would scare them away.
Seriously though. Wolf packs.