Why won't you come and play?

This is a delightful Bearded Collie pup, four months old, called Oscar - who wants George, the old man Yorkshire Terrier, to come and play with him.
George is resolutely unwilling, and quite happy to give the puppy a nip on the nose if he comes too close! He also gets very jealous if any of us give too much attention to Oscar.
And so we have a bit of a Mexican stand-off.
It will be interesting to see how the relationship develops over the next few days.