I might be a bit crazy, but I feel that they're so useless, compared to other carnivores (mainly because, on mobile, I don't have the snif hability) ;

Way more difficult to tame one, because they're spawning in groups, so everything would agro on you, plus the fact they'd spawn around Rex's and on coldest area ever makes them pretty late tames, so the saddle point is just useless, even more, it just weaker he wolf (almost as good as raptor, with the jumped attack in less)

Due to it's size slightly bigger than smilodon's, it better to get the big cat on cave (and stats are really comparable, so with few breeding skills, you would easily get a sabertooth as strong as the wolf, even considering the hat)

Last point, I have to agree that the hat increase it resistance, on fights

But after few fights, you would need to repair the helmet, witch would consume a huge parts, in your ressources, the exact same ressources that you'd get the wolf to farm, while other tames would not get this inconvenient

So, considering all of this, sabertooth is by far better than wolf (great farmer for everything like hide, chitin, and keratin, but doesn't imply to repair the only protection it got

So doesn't wast the ressources farmed from fights

To survive in the tundra you need to either have lots of campfires or have the certain armour (I can’t remember it’s name) made out of pelt. However pelt is hard to get so I recommend making a boat and stacking it with campfires and plenty of wood. Also stock it up with food and other spare resources and arrows (or bullets). Approach the island from the water and went you start freezing turn on the campfires. Find a safe place to get close to shore and start killing mammoths and other creatures there. As soon as you can I would recommend making the pelt armour and then you can turn off the fires. You can also bring some tames along with you to help. Once you find a pack of wolves I would try to kill the lower level ones and keep the higher level ones. If only one of them is a high level then knock it out and tame it. Then find another pack with a high level of the opposite gender. After taming that one I would bring both wolves back to your boat and go back to your base. Now you can breed the wolves as much as you like to get more wolves.

Direwolves don’t require a saddle to ride so taming one is an extremely good investment. Not to mention that they don’t lay eggs and they immediately give birth to baby making it easy to breed them which I would definitely recommend since getting your own pack of them is extremely powerful.