Google "prepuce human function" and check out the articles published by Wiley or that show up in pubmed. Tons of true facts and research about its function, from aiding in intromission to Ig A secretions. The WebMD statements about the appendix is consistent with what I wrote---the idea that the appendix has no function is being challenged by new research. You can google that too.
The point is, if we all assume that dew claws have no function, and no one bothers to investigate whether they have a function, then we cannot make informed choices about what to do.
Meanwhile I'm tired of speculating...I am checking out of this thread!