
If your friend is looking for working stock I would start by attending some field trials and watching dogs work, identify dogs you like for type, style of work , size etc and talk to their owners about their breeding. Try to find a common link in dogs that take your eye - for example sired by a particular dog Or a perhaps a good number of the dogs you like carrying lines with a particular kennel name. From this you can dentify a shortlist of breeders to approach for a stud. The shooting publications run adds for the studs owned by the top names/kennels, Ft secretaries for the spaniel clubs may also be able to help with contacts as may people he works alongside at the shoots he attends.
Sadly many working cocker breeders do no health testing at all .. in fact I suspect a health tested litter of working cockers is a rare as Rocking Horse ****. That said vets DO see cases of HD in working cockers and it is strongly recommended that the bitch be tested, finding a health tested stud may be somewhat more problematic. Also your friend will need to find a vet who will dock, working folk generally will not buy undocked spaniels and a work bred litter will not be suited to pet homes. Fortunately the DEFRA have now lifted the restrictions on docked dogs entering agility events where public pay an entrance fee so this opens up the agility market again for docked spaniels (pre AWB cockers were very popular choices)
K