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Those breeds should not be spayed or neutered that early, especially if they will end up doing any work or competition.
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While I agree it's better for the dogs long term health and wellbeing, I understand why the rescues spay and neuter as soon as they can.
If the dog isn't fixed by the time it leaves the rescue or shelter, there's a 50/50 chance they never will be, and there will be additional litters of accidental puppies. Or intentional litters of puppies without consideration of propper breading for health.
My neighbor mal pups I mentioned earlier were litter mates. The wife of the family decided she wanted to breed them, and they had one litter before they lost the dogs to the county. She got the dogs from a back yard breeder, decided to become a back yard breeder and the pups quickly overwhelmed them.
The rescue I volunteer with has a whole catalog of similar stories. They used to hold off on fixing the dogs, but even when they gave the adopters coupons for free spay/neutering, it rarely got done.