Hate to say it, but once you start down the SM path, you have a tendency to magnify every little thing that happens with your dog. You always wonder - is this too much scratching? Was her yelp of pain because I picked her up funny or is she always in pain? Is she quiet because of pain or because she's gotten weaker? You start to become hypervigilant and sometimes the line between being neurotic and just careful becomes very blurry. It's absolutely good to be aware and informed, but try not to obsess about every little behavior. There is no way to prevent SM from happening - except for breeders to follow scanning and breeding protocols and for pet owners to refuse to buy puppies or dogs from breeders who refuse to scan. Good luck.