Chihuahua Pictures

Rusco, Angel and actress Alyssa Milano attend the after party for the world premiere of Walt Disney Pictures' 'Beverly Hills Chihuahua' on September 18, 2008 in Hollywood, California.

Alberto E. Rodriguez, Getty Images

HOLLYWOOD - SEPTEMBER 18: Actress Jamie Lee Curtis and Angel (Chloe) arrive at the Walt Disney World Premiere of "Beverly Hills Chihuahua" held at the El Capitan Theatre on September 18, 2008 in Hollywood, California.

Berry King, WireImage

Hillary Duff and her pet chihuahua.

X17online.com

REESE WITHERSPOON (right) and "BRUISER" the chihuahua stars in Metro-Goldwyn-Mayer Pictures comedy LEGALLY BLONDE.

MGM

A toy Chihuahua named Beaner stays warm inside an inmate's jacket while other dogs play in the snow at Lansing Correctional Facility in Lansing, Kan. Dec. 9, 2005. About 100 inmates at the prison are training abused, anxious or aggressive dogs to be adopted as pets as part of the Safe Harbor Prison Dog Program.

Charlie Riedel, AP

Paris Hilton poses with her chihuahua "Tinker Bell" at the Tides Hotel on Miami Beach. Hilton was promoting her reality T.V. show "The Simple Life".

Bill Cooke, AP

A chihuahua puppy poses at Pucchin Dog's shop on July 11, 2007 in Akita prefecture, Japan. The chihuahua was born with a perfect heart-shaped marking on his back. Shop owner Emiko Sakurada has no plans to sell the puppy, which has been named 'Heart-kun'.

Koichi Kamoshida, Getty Images

A long haired Chihuahua is presented to the jury on the catwalk during the "Miss Canine Costa Rica 2008" in San Jose in July 19, 2008. In total, some 300 dogs will participate in the two-day contest being organized by "Pets y mas" (Pets and more), a magazine specializing in dogs.

Yuri Cortez, AFP / Getty Images

Britney Spears, holding her dog Bit Bit, and her husband, Kevin Federline, pose on the red carpet at The 2004 Billboard Music Awards Wednesday, Dec. 8, 2004, held at the MGM Grand Garden Arena in Las Vegas.

Eric Jamison, AP

A chihuahua and pug cuddle on the couch together.

Getty Images