Aduana y Senesca

I guess that varies depending on one’s starting point. Coming from Vancouver with my dog MEX is the better option. I can see that for many people originating from the US it could be less convenient.

Flying AeroMéxico we can typically leave YVR for MEX on an 11:20 p.m. flight, have a 6-8 hour connection at MEX and be at ZIH that day. The return trip is similar.

The Alaska Airlines option would require YVR-LAX, an overnight stay, then on to ZIH. The return trip would require another overnight stay in Los Angeles. I have lost track of what would be required of a Canadian bringing a dog into the US from Canada, then bringing a dog from Mexico into the US.

SENECA at MEX has always been pleasant and efficient. Typically my luggage is checked through from YVR to ZIH and customs/immigration has been a breeze.