So I picked up the Animal Archive, and I wanted to use the Animal Archetypes for a Cavalier I am playing. I was under the impression that since a Cavalier's mount did not get share spells it got the armor proficiency instead. After rereading the mount entry, this doesn't seem to be the case. So if I take an arcatype do I lose the the bonus feat (if share spells is replaced).
Jason Nelson suggests (until it gets officially clarified I guess):
"A cavalier's mount gains this ability automatically when selecting the charger archetype even though it does not have the share spells ability."