I would look for certification of both parents for the following OFA Hips(good or better), PFK and Eye CERF, although not common in field bred dogs they are things to be aware of.
I have been away hunting for most of the fall and just noticed this thread.
To my knowledge, PFK enzyme deficiency has not been diagnosed in fieldbred English Cockers. English Springers are a different story. OFA and CERF certifications are routinely done on breeding stock by most all reputable FBECS breeders. Happily, this breed has largely been held in "good hands" for breeding purposes to date and have relatively few hereditable
diseases.
