I never wondered before but was Snoopy intentionally mimicking the Great Pumpkin, just to tease Linus & Sally?
Snoopy isn't cruel. Playful, but not cruel.
Marriage is between one man and one woman, to the exclusion of all others.
Snoopy is anything Schultz wanted it to be at any given moment, almost literally. He can turn into a snake, vulture or coyote instantly. He also angrily fights Linus for his property and steals it, has 'boxing matches' with Lucy, does various acts of sabotage and so on.
I would say Snoopy is a psycho monster from some black lagoon and should never landed where Charlie Brown lives, his life is depressing enough without this omnipotent bully.