Leveling up Big Sally and thought wouldn’t it be nice if your animal follower gave you some buff.
My greater salamander follower aught to give be poison immunity.
Same for reapers and spiders. Spiders might also give a climbing buff.
Jaguars and panther could give an agility buff.
Rhinos and elephants give an armor buff.
I’m sure the rest could be worked out. I mean if your character has a house cat follower they would just turn and wander off while you’re trying to do something 
Oh, ya, Big Sally 
see if that works!