So, I'm starting up a Beast Rider Cavalier with levels of paladin.
At first level(cavalier) I get a mount, and I can opt to upgrade to a newer, stronger mount whenever I gain a level in beast rider. The animal is treated as a druid's animal companion with my cavalier level as my effective druid level.
At my fifth level of paladin, I can designate a divine bond, either a weapon, or a mount. The mount is treated as a druid's familiar with my paladin level as effective druid levels.
So here's my question; Can I stack the effects of the two classes, giving it the cavalier training (light armor, etc.) as well as the paladin's summoning and shared spells?