to pounce upon him, he wasn't going to be caught napping.

Another thing which drew him toward the mouth of the pipe was the fragrant
odor of good things from the garden. In spite of the big feast of the
night before, Bumper was hungry again, and he longed to get back in the
garden and devour a few more carrots and crisp lettuce leaves.

He was within a few feet of the mouth of the drain-pipe, quite confident
that Carlo had grown tired of watching and left, when a shadow came
between him and the light. Bumper caught sight of a head and forelegs
thrust into the opening, and then, without stopping for further
investigation, he turned tail and ran back. There was a wild scampering
and scraping behind him, and he knew that Carlo was pursuing him in the
hole.

But Carlo couldn't follow him very far. The pipe narrowed so that there
was just room for Bumper to squeeze through, and no dog, certainly not a
big dog like Carlo, could catch him in there. When he reached the place
where he had spent the night, he stopped to look around him.

Horror of Horrors! Carlo or some other animal was close behind him,
blocking the entire entrance to the hole. Bumper could hear him scraping
along, and could almost feel his breath. A shiver of terror went clear
through him. In some strange manner the hole had been enlarged over night,
or Carlo had shrunk in size, or what seemed more probable, another dog
much smaller had taken up the pursuit.

With a little yip of fear, Bumper scrambled onward again, making his way
through the drain-pipe as fast as his feet would permit, which, after all,
was not so very fast, for he slipped and lost his footing a dozen times,