Cancun Hotels Kuartos Mexico Reservations made easy!: 

Pets traveling to Cancun
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Kuartos.com on 19 October, 2007 11:44:00
 
Only cats and dogs may enter the country. Transportation requirements include a
signed letter by a veterinarian listing vaccinations and indicating that the
animal is in good health.
In any case, we recommend leaving pets at home since most hotels are not
equipped with services to accommodate them. The small hotels of the Riviera Maya
may have options, but we suggest checking beforehand.
There are special guidelines for handicapped people with dogs .