I agree with the declawing - it's cruel.
I'm not an expert on dog or cat speciation - but I know that dogs are considered a single species. And I don't think that the different breeds are even considered subspecies.
In modern times cats are not only bred for appearance but, more importantly, for temperament. And out-crossing between the 2 parental types is often done (eg. a Tonkinese is a cross between a siamese and a bumese)- so the incidence of genetic defect is lessened. Personally I am conflicted when it comes to breeding for type - is it better to do this type of breeding or should we just let the animals run wild and self-select? And with random selection, is it even necessary or ethical to neuter?
From your comments I would wager a guess that you would never have, for example, a Golden Retriever. Do you have any pets?