This is a very clever ad campaign for Iam's Dog Food! The vinyl stickers are placed on the back window of car so when it rains, it looks like a dog's tail wagging. Even when not in motion, the ad is very eye-catching.
No big surprise that the clever campaign comes from ad agency, Saatchi & Saatchi, Paris. Saatchi & Saatchi is an agency that has won tons of world wide awards for effective advertising and marketing.