Hey folks, new guy (to the forums) here,
Regarding pet drones, the only real mention of them I can find of them are mentioned on page 118 of Arsenal under the, "Entertainment Systems Falcon (Aerial Pet Drone), continuing on to page 119, last paragraph of the entry. There is mention that the stats given for the Falcon are meant for aerial pet drones, but your GM should modify the speed and acceleration according to whatever, "pet," type you want to have.
Otherwise, perhaps taking whatever approximate drone size, working with the modifier given for, "special equipment," by perhaps doubling/tripling the price/capacity/availability/time to modify the drone with your GM might be a solution.