Pip, Not sure exactly what you are trying to get at, my dogs are owned by myself but bread by Brian. Out of all the digging which we do together i would say the split is 50 / 50 with regards to who's dogs work.
Obviously I have dug numerous times to Brian's dogs anything from 15mins and 18 inches to 12 hrs and 27 feet, YES 27 feet and we needed a JCB to dig the first 25 ft. Pictures attached.
a deep one bud did it all end well.