Here are 90 fun facts about Mexico you might not know ... Mexico City is built over the ruins of a great Aztec city, Tenochtitlan. 20. The Chihuahua is the world’s smallest dog and is named ...

Like most breeds, their exact heritage is hazy, but Chihuahuas are likely to have been established in Mexico centuries ago, where their ancestors were deemed to have sacred powers in Aztec and ...