Read it through once

“The warning was no idle one, for two nights later I happened to look out of my bedroom window about two o’clock in the morning. It was a beautiful moonlight night, and the lawn in front of the house was silvered over and almost as bright as day. I was standing, rapt in the peaceful beauty of the scene, when I was aware that something was moving under the shadow of the copper beeches. As it emerged into the moonshine I saw what it was. It was a giant dog, as large as a calf, tawny tinted, with hanging jowl, black muzzle, and huge projecting bones. It walked slowly across the lawn and vanished into the shadow upon the other side. That dreadful sentinel sent a chill to my heart which I do not think that any burglar could have done.