In recent years, we have found evidence in the Negev Desert of the Middle East of a striped hyena, a solitary carnivoran, tagging along with a pack of wolves. This sort of alliance is found nowhere else on Earth, and we're still not sure if this was just a one-time deal.
But in an alternate Earth, this sort of alliance runs far and deep. So deep, in fact, that both species--wolves and hyenas, doesn't matter where we're talking--have evolved symbiotic relationships with each other. We've seen these sorts of results when we turned wild canids into domesticated dogs--our growing symbiotic relationships with them have resulted in some behavioral and morphological changes.
So in an alternate Earth where wolf packs and hyena clans have evolved to live side-by-side, would we expect to see any anatomical and behavioral changes as a result of these symbiotic relationships?