It's the harder strategy to play against, but I've managed to get comfortable playing against it solo, so a lot of these are going to be single strategies (and a wishlist for what your partner does). At a distance, as the wolf traitor, there's a few ways to beat this. Early kills, at least one. This ensures that both traitors cannot be exiled. Poke and prod at them with poison crossbows, hit and runs can really be disruptive, especially before Defector can open their crate(s). The surprise attack by your traitor partner becomes pretty vital or their sacrifice. If your sheep can secure two or more kills, that's probably the biggest boost to your chances of winning, even if they die in the process. Lastly, make at least one big play before you are exiled, but do not die.
Playing more socially against this type of play style can be a bit more difficult. A few effective strategies that I've found that work. This one is more direct, but it involves taking things personally, or causing drama/confrontation. You have to really play up the survivor violence and get everyone to stick around so you two don't actually murder each other. Additionally, being the loudest/confident voice in the group helps, lead them around, be dismissive (i.e. "we have like 25 minutes, why don't we just go do this quickly?" - it never goes quickly, they drag their feet because it's not objective oriented and unfamiliar).
There's a bit more of an indirect approach which has the potential of paying off throughout the game, if you have a strong partner. Most of these types of players get very comfortable with the thought that since you are not away from cabin juicing and helping with objective, you must be a survivor. You can use this to spread misinformation, make simple mistakes, use the survivors around you to get suspicious of the others, sometimes they'll kill them for you too! As the leader, you can push people to stay at low stats, since it's a necessity to keep moving, etc.