. . . or so they attest about the unscrupulous Mr. Tod (a fox) in Beatrix Potter's The Tale of Mr. Tod.
I've posted about Miss Potter before. However, you may not have seen this page on her keen observations of natural history and how she worked them into her charming books.
Though I don't think dormice actually say "very snug". They probably think it as they shnooze the dark winter days away. Smart dormice.