You see this a lot: the tiniest kittens want to make friends with the biggest dogs. I think the dog in this video wants to take a nap but is too polite to shoo the kitten.
This kitten reminds me of our cat, Buster, whose mission in life was to make friends with everything and everybody (except spiders: those he ate). He’d have loved it if we’d had a dog.
Yes, it is always surprising to see this scenario, but it happens so often.