They LOVE each other so much! We got Xander the kitten after we had Willow the grey, so he was never afraid of her. He often runs up to her for headrubs; they sleep together sometimes and groom each other. They're very very close; it makes up happy. They're actually closer than Xander is to our other cats! And our other cats were adults when we got the dog, so they all get along ok but don't have a lot of major loving or anything like those two.