As of June 1, 2012, Mexican regulations (Circular CO AV-07.8/07 R2) allow airlines to transport service animals and pets in the passenger cabin, as long as the animal in question does not pose a risk to the health and safety of the passengers and crew, and provided it complies with the airline’s policies and procedures in this regard. Please consult your airline to see if your animal meets the specific requirements. For further information on Mexican regulations, consult the section  "Taking pets to Mexico".