BigNorseWolf |
You couldn't retrain animal companions, because they don't have prestige.
For most familiars you should be able to catch and release for 200g, that is you let your familiar go and then re acquire another one.
There is a certain particular familiar that that may or may not work for though. And he may not be able to take an archetype at all. Campaiagn leadership will have to weigh in on that.