I would like the fit for historical purpose aspect of the breed regulations tightened up. I do think it woud stop the severe extremes that have been bred for the show ring looks wise that have gone onto cause serious health problems.
e.g Bulldogs who now can't give birth naturally anymore
Banana backed GSD's that are fook all use to the police as they aren't fit enough
There was a nasty strain of labs with a rep for biting humans that arose because of one mean tempered champion show sire. As he looked good he was allowed to sire waaaay too many litters - passing on a mean temperment in a breed not previously known for it.
I'd also like to see the odd non-kc reg but great breed example with the constitution of an ox and great temperment allowed to pollute the KC register more often. Also a wee bit more outbreeding to diversify SOME breed's gene pools in cases where there is high incidenc. of genetic problems. Dog breeding for healthy examples does seem to be hitting an all-time low in the UK and imho the KC has not done nearly enough to prevent this, by allowing the show ring to dominate all other factors for too long.
I've noticed that I seem to favour those breeds where the "working" aspect of the breed has not completely died out and part of this is because the "working lines" do seem to be hardier, healthier canines generally iyswim.
Our dog is a whippet - non-KC reg, cos tbh I'm less than impressed with the kennel club's whole dog snobbery thang. She was also a rescue cos for the life of me I can't see the point in parting with £700 for a posh puppy when £100 for a rescue will do the trick. (I also never bought into the Nike trainers or the premium for kelogs cereas either lol!) We walk the dog, not the paperwork.
The best poodle studs are not used for the whole "doodle" phenomena as their owners won't allow it, so that particular "designer cross" is almost doomed to have health issues now sadly.
She was chosen to be a therapy dog for my ASD son - so I had VERY specific temperment requirements that meant she was not the first example of her breed I looked at before we chose her, though I knew I'd find the animal I was looking for from within that breed. Not every heinz 57 could do that job.
Not al "pets" are the same - people do have different requirements from their canine companions to fit in with the huge diversity of famiy types and lifestyles - to pretend otherwise is very disingeneous.