When I'm writing for The Shadow of the Dog Lord, breed is irrelevant for me, I am more concerned with the overall generic specie. I often view breed as how we view "race", no matter what race you are, you are still human, the rest is irrelevant. So, it's just fox, or coyote, or wolf, or dog, but I frequently even ignore that, simply referring to them a the "Free Canids". Most of my dialogue concerning specie is Fenrir's, since he feels his own specie, wolf, is superior and exercises that belief.
Can't help with question 2, since in all my writings so far ungulates have not evolved from their real world counterparts and are used as work animals/mounts.
Cheers,
LordFenrir