Actually 'good dogs' are a very good ilustration of the dangers of inbreeding. There's some breeds where you basically can't get a healthy dog now, and that includes the ones winning shows.
Inbreeding will increase the chance of getting the genes you want passed on. But it will also increase the chance of getting bad recessive genes in a double dose and therefore having problems. At least with orchids there's not the welfare issues that results in for animals.
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