Snowy, The Adventures of Tintin
Where would Tintin be without Snowy? Dead several times over, we expect (and vice versa, of course). Snowy is a goldmine of cynical commentary and fond eye-rolling to Tintin’s happy-go-lucky optimism (especially in the earlier books), and though, true, he sometimes gets distracted by bones, he is excellent at chewing through restraints. Just keep him away from Haddock’s whiskey.