John only gives Arthur one glance and a gruff defense of it will make her happy before he hops up and is suddenly a large fluffy golden cat. He's still large-but-normal-cat-sized for the moment until he pads a few feet away and then grows to be tiger sized, the fluff growing right along side with him. He will pad over now and loaf on the ground near the both of them before they'll both hear.

Well? Go on.