This is a quote from the book "Animal Farm" by George Orwell
...animals following at a respectful distance. At every few steps Napoleon stopped and snuffed the ground for traces of Snowball’s footsteps, which, he said, he could detect by the smell. He snuffed in e very corner, in the barn, in the cow-shed, in the henhouses, in the vegetable garden, and found traces of Snowball almost everywhere. He would put his snout to the ground, give several deep sniffs, ad exclaim in a terrible voice, “Snowball! He has been here! I can smell him distinctly!” and at the word “Snowball” all the dogs let out blood-curdling growls and showed their side teeth.

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