Why Does My Dog Turn Around Three Times Before Lying Down?

I’ve pondered this one for years and years and years. It could be to flatten the grass, or it could be [determining] the correct direction to face in terms of comfort, and safety, and view. It could be the dog’s having a good look around him before he decides to lie down because he will be vulnerable if he falls asleep, and… I really haven’t got a clue! It’s certainly fun to watch them do it. You just think, “Oh they’re getting much more comfortable now.”