Yeah, I agree. It's a difficult enough philosophical problem to understand the mental states of even another human, much less an animal with a completely different brain structure. There has been some work purring dogs in fMRI machines that shows that their brains respond to humans in ways that indicate they like us, but that's pretty far from conclusive. After all, I know my dog likes dinner, so she'd probably display activity in the pleasure center when presented with a bowl of her food. In any case, what matters is that I love her, and she is doing nothing to disabuse me of the notion. ;)

Oh, and, yes, I did choose hyenas specifically because they're a misunderstood species. Glad you picked up on that.