Above)
Maykenzie's photostream at Flickr had this delightful photo of Asahi, a blissed-out chihuahua, being shown how to impersonate a rabbit. This chihuahua and other dogs appear in more photos in Maykenzie's "Mothers Day" Set:
Asahi and Mother's Day

Below)
"Honey Bunny 1" by EllenJo, one of the world's greatest chihuahua photographers, with her usual subject, Floyd, this time wearing a costume found at the Goodwill. You'll laugh out loud noodling through this album of Floyd portraits:
The Amazing Floyd