Thinking back to the time I flew F ATL-LGA and a woman brought a dog on the plane with her that relieved itself no fewer than two times during the flight, without an apology to the other passengers in F or the FAs who had to smell its business for 2 hours...I'd prefer you didn't bring it into F at all, personally.
That being said, SeatGuru is pretty good about noting seats that don't have any underseat storage.