Odds of intelligent life occuring?

[Anomalocaris]

I'll put my money on the dogs. There's a reason why "treed cat" is a phrase in English.

My barn cat, not yet two years old, tore up a German shepherd who invaded her space.

That's only because dogs are capable of, but not constrained to, being gentlemanly.

My neighbor has a St. Bernard capable of turning any cat and sizeable fraction of the adult human population into a single paw print. He takes up an entire elevator car, and horses turn and bolt when he approaches.