Yes. Every single day I see health problems in dogs caused by reckless inbreeding.
Well, the way I read his description of the lines is this.
The grand sire of his intended bitch is 2 generations back to a bitch unconnected to the intended sire for this litter which is why I asked if that bitch was an outcross. That is a fresh gene pool coming in from that bitches side, but please correct me if I am wrong as I genuinely would not want to make a mistake like that myself in future.
According to the kennel clubs guidelines of acceptable breeding this is not even close to being a banned mating.
I don't always agree with their logic but I assume they sought veterinary advice on this one.
I used a similar mating on a bitch of mine. She had 4 pups. Each and every one went on to live until they were 14 or so. The one I kept, because it was a mating for me as I wanted a pup from her, was at the vet twice in her life for health reasons, both times for a bad tooth. Not even for annual boosters as I pick the stuff up and do it myself. Her hip score was 4-3 if memory serves, and a doddle to train to the gun. She was an exceptional dog to work, not just in my opinion but in thatof those that knew her.
The owner of her sire is a well known professional gun dog trainer/breeder and still competes in trials as well as competing for the Scottish team. He has in the past introduced show blood to his bitches to introduce new genes and better looks to his lines as he felt the trialling dogs were going the wrong way for him in their snipey looks. I has never been anything to do with the money for him as quite frankly he does not need it. Although he was careful to use a stud that was a known worker as well.
We discussed the issues of any inherent defects showing up in the mating of my bitch at the time but as neither parents had any physical defects or health problems we were aware if, and the fact that on one side of the grandparents it was a complete outcross, if I am using that term correctly, we went ahead. I also mentioned the intended breeding to one of the vets in my practice who ai shot with and he agreed there was no concerns in his opinion assuming everything we knew about the parents was okay.
I am glad we did and for the 12 years the pup from them worked for me...