Actually, I would be easier (based on the anatomy of the animals) to ride a goat than a wolf. They may not, anymore that the GoBacks with their Elks, the Sun Villagers their Zwoots, or even the humans their ponies, need to share a bond of blood. Maybe I'm mistaken, but I thought that the Go-backs were the descendants of Two Spears' group after they were separated from Two Spears, his hunting party, and the tribes Wolf, when Willowgreen removed their wolf blood. Khavi's book doesn't show (as far as I remember) any meeting with an other elven tribe after the group returns to her. Could it be that
1)Two Spears hunting group was the only pre-GoBacks met those goat riders or herders?
2) or Khavi's pre-GoBacks and the Goatriders may have mingled during Kahvi's long sleep?