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I've found shelter dogs to be more resilient. It seems that's because they're almost always mixed, instead of bred in less-than-ideal conditions with possibly less-than-ideal genes.

The genetic lottery a mutt has tends to make it a better dog.

This is only my experience with 5-10 adopted dogs, though, and 3-5 pure-bred dogs.

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I've been told that by many Vets. The genetic mixing really helps.

I'm not sure if this is true but one told me most of the golden retrievers in the US can be traced back to just three male dogs from the mid-70s. He said its the cause of a lot of their hip and cancer problems that are common in the breed.

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