Aww....  he used  to be so tiny! Now he's a big dog, and he's finally outgrown the catflap! This means no secret rolling in the mud, no voyages out the gate, no chasing poor Alf the cat up the garden fence! This doesn't mean though he won't try to get out via the trusty old catflap. He squeezes himself through the miniscule hole even if it involves a bit of crying. Stupid mutt!
And the cat may not have won yet, but he does have a secret weapon. He will time himself, go to the catflap when Oscar is stuck there and swipe at him! Then, before the furious hound can escape, Alfie leaps onto the fence and starts  licking his paws. Sneaky!