I have mine up to level 65 now...damn, leveling in the 60s is slow...
Anyway, it's a wolf. Exactly the same as all other wolves, except it looks different. It can bite, dash, use furious howl, etc. It eats meat. It's growl does sound a little different, I think - I haven't pulled out my original wolf in a while to compare, though. It also walks differently. Other than that, it's exactly the same as all other wolves.