A lot of these wonderful dogs are bred by the owner who already has a trained female dog. It's a way to pass on good traits and not a business or puppy farm. The mother not only has the pups, but helps train them to hunt when they are ready. Making owners render their dogs sterile will not improve the breed and will make good hunting dogs much harder to get ready for the field.
In short, this law is anti hunter and not one that will carry on the best instincts of the dogs.
These are some of my "pet" peeves, and one reason I've almost come to hate dogs. I get tired of muddy paw prints on my clean clothes, and dogs I don't know coming up and licking me with the same tongue they lick their @$$ and b@!!$ with, refusing to back off even when you yell at them. Farm dogs do a lot of that, too.
I don't mind people having dogs, just don't let them slobber all over me and jump on me. Too many dog owners any more think it's cute or funny, just like they do with undisciplined children.