something like a Sheltie (incredibly stubborn, herds everything in its vicinity, adores kids, no one can stop it from retrieving a lost lamb even if the "lamb" is actually a rock that it has fixated on for some reason) or a terrier (unshakably loyal to everyone it decides is its own, will bite anyone else's ankles, unquestioningly obeys every order it agrees with and ignores all others).
Re: Babylon 5, season one
Sold.