I noticed that once I got near to the last boss stage, the only raid that spawns is the wolf hunt.
I'm guessing that once Mistlands is complete, there will be a Plains version and I guess, eventually a Mistlands version. I always carry a levelled atgeir, so I don't find wolves too much of a problem, but I tend to move around the map a lot, so I rarely get raids near my main base. I usually just use either the landscape or other creatures to distract/defeat the main brunt of the wolf attack, then pick them off.