So I still don't know if/when I'll be getting a Sheltie puppy (should have more info beginning of Sep) but I want to be prepared so I'm looking at soft airline carriers so I can bring a puppy home on the plane. I'd like to get the largest size the airline allows. Amazon has a bewildering collection of airline carriers! Any recommendations for a good brand carrier for an 8 or 9 week old pup? My airline only allows a carrier that will fit under the seat, so it has to be 16" x 10" x 9.5" or less.