What are the names of Christina Aguilera's two canine companions?

Depends on where you look.

Aguilera and her mother, have six dogs, two cats and three guinea pigs, which turns the Kearns household into Noah's Ark when Aguilera visits, her mother said. Aguilera's three dogs -- a bull mastiff named KoKo and papillons named Chui and Stinky -- previously had microchips injected at Bradford Hills Veterinary Hospital.
http://www.post-gazette.com/pg/05146/509614.stm

CHRISTINA AGUILERA WITH HER DOG - LUCY (BICHON FRISE)- Singer Christina Aguilera holds a Bichon Frise dog named Lucy, during a photocall at the Harrods Department Store in London, Monday June 28, 2004, after Aguilera opened their summer sale.
https://www.gettyimages.com.au/detail/news-photo/singer-christina-aguilera-kisses-bichon-frise-lucy-as-she-news-photo/829087506

Chewy and Stinky

Christina Aguilera, whose two beloved Paps answer to the anything but-elegant names of Chewy and Stinky. - See more at: http://moderndogmagazine.com/breeds/papillon#sthash.noWo2M8K.dpuf

http://moderndogmagazine.com/breeds/papillon

she actually has three dogs

Aguilera's three dogs -- a bull mastiff named KoKo and papillons named Chui and Stinky -- previously had microchips injected at Bradford Hills Veterinary Hospital.


http://www.post-gazette.com/local/north/2005/05/26/Christina-Aguilera-funds-pet-project-donating-microchip-scanners-to-police/stories/200505260289