The Nuance and fun for non-animal companion classes makes this very hopefully engaging.
Pets! (Non-magical pets — and the wacky interactions therein.) Marginally trainable, not-so-dumb-animals: guard dogs, pickpocket baboons, attack horses, warning sparrows, jackass cats, infiltrating rats, keeping-an-eye-out-owls. Tons of character fun.
I hope the book can advance the fun and utility of that.