Thanks for the response [MENTION=13310]ricktoronto[/MENTION] - that definitely makes sense.
I guess I was most concerned about the rapid change in pricing and whether it would change back as rapidly - seems like that may only happen sometime in June.

It went from a $500 credit to $1300 charge for the 2 ticket change overnight and over 2 months before my flight.
We are good w/ going to Oaxaca but will just leave our dog at home, so not worth $1600 more to bring the dog and cancel the Oaxaca segment for us right now.

I just wish there were a way to remove the flight I don't need while keeping those we want and just pay the $200 change fee + $50 Rebooking fee that Aeromexico would charge per ticket with any credit that would be offered from one less leg of the trip.