Rupert sneaked into the kitchen where there's a chicken in the oven. He thinks the oven is some kind of marvellous TV with smells instead of sound. There's a cooling mechanism that fans hot air out of it and Rupe was snuffling the chickeny air, inhaling deeply and drooling.
We didn't have the heart to shoo him out, despite the no-dog-in-kitchen rule. Watching him was better than watching actual TV.