Pets
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"U.S. visitors to Mexico may bring a dog, cat or up to four canaries by presenting the following certificates at the border:
"(1) A pet health certificate signed by a registered veterinarian in the United States and issued not more than 72 hours before the animal enters Mexico; and (2) A pet vaccination certificate showing that the animal has been treated for rabies, hepatitis, pip and leptospirosis.
"Certification by Mexican consular authorities is not required for the health or vaccination certificate. A permit fee is charged at the time of entry into Mexico."
Drugs
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"Avoid drug offenses.
"Mexico rigorously prosecutes drug cases. Under Mexican law, possession of and trafficking in illegal drugs are federal offenses. For drug trafficking, bail does not exist. Convicted offenders can expect lengthy jail sentences and fines. Sentences for possession of drugs in Mexico can be as long as 25 years plus fines. Just as in the U.S., the purchase of controlled medication requires a doctor's prescription. The Mexican list of controlled medication differs from the U.S. list and Mexican public health laws concerning controlled medication are unclear. Possession of excessive amounts of a psychotropic drug such as Valium can result in your arrest if the authorities suspect abuse. Mexican law does not differentiate between types of narcotics. Heroin, marijuana, and amphetamines, for example, are treated the same. Offenders found guilty of possessing more than a token amount of any narcotic substance are subject to a minimum sentence of 10 months in prison, and it is not uncommon for persons charged with drug offenses to be detained for up to 1 year before a verdict is reached.
"Remember, if narcotics are found in your vehicle, you are subject to arrest and your vehicle can be confiscated."
Firearms
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"WARNING ON FIREARMS
"Mexico has severe penalties for taking in any type of firearm, weapon, or ammunition without first obtaining written authorization from Mexican authorities. It does not matter whether U.S. citizens are licensed to carry the firearm in the United States, or if they unintentionally transport it while driving in their vehicle, or have it in their luggage while traveling by commercial or private plane or boat. It also does not matter if visitors to Mexico are U.S. law enforcement or military officials. Mexican authorities strictly enforce laws restricting the entry of firearms and ammunition along their borders and at air or seaports."