Would it help to take this wording to the breeder? This is from the AKC breed standard. I know it refers to dogs in the show ring, but, for me, it is what I strive for:
Feathering on ears, chest, legs and tail should be long, and the feathering on the feet is a feature of the breed. No trimming of the dog is permitted. Specimens where the coat has been altered by trimming, clipping, or by artificial means shall be so severly penalized as to be effectively eliminated from competition. Hair growing between the pads on the underside of the feet may be trimmed.