A beardog? I admit that that would be pretty cool to see in-game. I only ended up going with vulpines because I like foxes.
Either way, I would love an animal that can aid small tribes and solo players in exploration. None of the new creatures offer that. Out of all three, the Amargasaurus is definitely the most appealing, but it really wouldn't fit my playstyle as it appears to be a PvP focused creature with slight utility in PvE as a sap collector.