Great. Could you point me towards some suitable breeders?
As VSS has said, breeding spaniels with better tails is easy, and it has always been obvious that tail docking is painful. And that doing it has a cost. These facts are not in any way new discoveries, and will have been equally well known for at least 200 years. Therefore, it is logical that plenty of breeders will have bred strains without this problem.
The sarcasm does you no favours.
If you've been reading the thread (which I hope you have, as you started it) you will be aware that breeders have not developed strains with shorter or more robust tails. They could have done, at any point in the development of the breed, but chose instead to breed long tails and cut them off.
Whether or not that practice is still acceptable in the light of our greater knowledge of the way in which animals feel pain and suffering, is a moot point. Some say it is, some say it isn't. If, on balance, the general consensus is that it isn't, breeders still have the option to resolve the issue through genetics.
However, any suggestion of doing so will be fiercely resisted by a lot of rather ignorant traditionalists who believe that to attempt to do so would "destroy the breed". Same sort of dull attitude as a few of the posters in this thread have demonstrated, seemingly of the opinion that the current spaniel cannot be improved upon, and any attempt to do so would ruin its working ability. Totally groundless fears.
I have been fighting exactly the same argument from Welsh hill farmers for years, with regard to genetic improvement of the Welsh Mountain breed of sheep. So I got together a small group who were interested, and we decided to go it alone, without the support of the breeders associations. We're now the biggest collaborative breeding project in Wales (if not the UK), we've DNA sampled tens of thousands of sheep, we're the first sheep breeding project in the UK to use genomic selection methods, and we attract a considerable amount of government funding.
With the methods of genetic evaluation and statistical analysis available to us these days, progress is rapid. We're also able to make very accurate predictions of the likely outcomes of different matings.
All of this stuff could equally easily be applied to breeding dogs, if anyone were sufficiently forward thinking to undertake to do it.
Or you could just keep on cutting the tails off, instead of breeding animals that were properly fit for purpose. At the moment the choice is yours, but it might not always be. So why not get ahead of the curve?