What is papi from Beverly Hills Chihuahua mixed with?

"Papi" from Beverly Hills Chihuahua is a Chihuahua. He is not a mix of any other breeds. The movie's storyline is based on a purebred chihuahua named "Papi".

The Chihuahua is a small breed of dog that originated in Mexico. They are known for their loyalty, intelligence, and feisty personalities.