Mind you...

...he's getting better with animal noises.

Daddy points at dog. 'What does he say, Leo?'

Leo [in the manner of a barking dog]: 'hnnh, hnnh.'

'Very clever boy!' says Daddy, and points at Bonzo. 'And what does he say?'

Leo: emits short, high-pitched squeal, i.e. right on the money. Applause.

Mind you, you could point at a lamppost and Leo will sometimes tell you it says hnnh, hnnh too. But he does basically get it. You'll often be walking along with him when a quiet 'hnnh, hnnh' emerges from the pram. Sure enough there'll be a dog nearby, even if it's on a plastic base with a coin slot in its head.