Top Cat and the Beverly Hills Cats (movie, 1988)

Beverly hills dowager leaves everything to Benny the Ball because her only rightful heir, her niece Amy, is missing. But that's only if Benny stays alive for 48 hours. If not, evil butler Snerdly and his mad Russian Wolfhound are next in line - and he's quick to pull every trick in the book to do poor Benny in and the troop sets off to rescue Benny and find the lost heir Amy.