From PRD: http://paizo.com/pathfinderRPG/prd/classes/druid.html#druid
"BAB: This is the animal companion's base attack bonus. An animal companion's base attack bonus is the same as that of a druid of a level equal to the animal's HD. Animal companions do not gain additional attacks using their natural weapons for a high base attack bonus."
Okay, I was misinterpreting the OS provided automatic BAB iterative. It doesn't appear to be DATA.