This message is edited because I accidentally posted almost identical messages twice, and cannot figure out how to delete. Sorry, just learning how this forum works.

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Wow, thank you so much for all of this information! I didn't see any notification, and only just saw this now. I'm impressed by how much you know.

In case you see this, it turns out that I can change a previously unused portion of an Iberia flight. I cannot fly my dog from BOS to TNG since he's too big to go on the MAD>TNG connection via Air Nostrum, but I can do Iberia from BOS>MAD>CMN as you suggested. I am curious if you have experience with Iberia, and if you know whether they are good to the doggies in cargo? Thanks a million for all this info.

Oh and as for the Frankfurt option -- it's okay to take doggies on shuttles there?