Varwolves are pretty timid by nature, so it may take some time and a lot of searching to be able to find and befriend one… But if you know where to go, you might be able to start a quest that will lead you to the Varwolves’ home!
If you don’t want to go to all the trouble of finding one though, you can always look for a Morphing Potion or use the Premium Subscription’s Pet Species Change perk!