invisible dog 

1.When a dog remains perfectly still while also averting his face to avoid attracting attention. Sometimes used in response to
the question "who ate my shoe?"
2.Can also be used by a person to the similar effect,see "invisible husband"

" Bart's effective use of invisible dog in the photo on petfinder.com got him a new home."

shy dog timid wasn't me silent invisible avoidance

invisible dog by Bart's Mom August 5, 2009