B. Darwin says of the fifth, "The green is something in the shape of a hog's back; immediately on the left of it is a stagnant pool of water, and on the right is a stream..."
Viewing NAF's photo, there has apparently been some good drainage work in the intervening century if Mug's Cottage or Hollow was once "a stagnant pool"!
Too bad you aren't allowed to take your dog on US courses, that looks like great fun. And you could teach Rover to fetch those errant tee balls during practice rounds. Golf in the UK is wonderful, isn't it?