@dlowan,
I don't think (actually I haven't really thought about it until now) I have ever met a mammal without a personality.
Let's see: Cows, horses, monkeys, (dogs and cats, of course) goats, sheep, pigs (piglets are so cute I cry every time I have a BLT) and those little weasel things~~ ugh~~they had personalities, bad personalities.
Some birds I have known are smarter than some of the people I have worked with and for.
My grandmother had a weasel on her farm that she claimed was the devil.
Joe(carried off a fat hen through a locked door.) Nation