Robert L. Short said this quote

“ as Schulz himself has pointed out, Snoopy is capable of being 'one of the meanest' members of the entire Peanuts cast ... he is lazy, he is a 'chow-hound' without parallel, he is bitingly sarcastic, he is frequently a coward, and he often becomes quite weary of being what he is basically -- a dog. He is, in other words, a fairly drawn caricature for what is probably the typical Christian. ”