
On the other hand you are entering the dog not for competition, and by the fact of being within the show you are putting the dog on exhibition, the fact that you are not competing does not matter.
We have just had a similar problem with the entry of NFC dogs at the show I am associated with, an exhibitor insists they can enter a pup under 6 months at this show, it is not a breed show. We, the committee, say it is against KC rules and so they can't. The person concerned has been making a big fuss about it but the fact remains the KC say no and I think the docked dog would be the same, ask the KC is the safest way at least for the show society who would be the ones paying the fine.