So I'm leaning toward getting a turbo Mooney for my cross country flying needs and the only reason I'm hesitant is because I often fly with my dog Stella, a 2 year old black lab. The long trips I would make in the Mooney would be with my dog and would be at high altitude to take advantage of higher true air speeds. This dog is part of my family and I don't want to take any chances with her life. Given that, does anyone here have experience with and/or recommendations on using oxygen masks with their dogs at altitudes in the high teens and lower 20s?