I'm a dog, and because you humans are much less rational beasts than I, you're telling yourselves, 'Dogs don't talk.' Nethertheless, you seem to believe a story in which corpses speak and characters use words they couldn't possibly know. Dogs do speak, but only to those who know how to listen.
The quote reflects a dog's perspective, suggesting that humans often underestimate their ability to communicate. The dog points out that while people dismiss the idea of dogs talking, they willingly accept more far-fetched stories, such as corpses conversing. This highlights a contradiction in human thinking about reality and communication beyond typical boundaries.