The main character of Kenneth Graham Duffield's 1920 children's book The Little Puppy That Wanted to Know Too Much (Philadelphia, Henry Altemus Company) is a puppy named Snoopie. (The moral of the book, as stated at the end, is "Too Much Curiosity About Your Neighbor's Business Will Always Get You into Trouble".) Snoopie has three siblings named Bouncer, Pouncer, and Rover. Based on the illustrations, I'd say he might be a collie, though I'm not knowledgeable enough to tell for sure.
Perhaps Charles Schulz and/or his mother Dena was aware of this book; or perhaps they were not aware of the book, but were aware of "Snoopy/Snoopie" as a dog name that was obvious (i.e., because dogs often like to snoop around) and well-known.
Regarding Dena's comment about her liking for the name, perhaps the real meaning of her comment was not that she was claiming to have invented the idea of using "Snoopy" for a dog, but rather that she had a particular liking for that already-well-known dog name because it happened to sound like the Norwegian term snupi.
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