Sam Ronson's Killer Dog Day Afternoon

1/12/2011 9:30 AM PST
Samantha Ronson took her adorable bulldog Cadillac -- who allegedly mauled a little Maltese pooch to death at her old apartment building in West Hollywood last year -- for a walk through Venice on Tuesday.

The dog had allegedly been shipped to the East Coast to live with family after the incident ... but clearly, the bitch is back.

Meantime, the owner of the dead dog is suing Sam -- and the apartment complex -- for $750K.