Regardless of your stance on it, inbreeding for one generation will probably not have any dangerous effects. As a species, we consider inbreeding to be taboo, but that is a cultural trait that was passed down from our hunter-gatherer roots when mating/marrying outside the small group was essential so you had ties in other groups when food ran short where you were. This cultural taboo is what makes us resistant to the idea of it happening in the animal kingdom, especially in these types of situations because we tend to anthropomorphize our pets. The truth is that it does happen in the wild when necessary without mutant critters running rampant. Even with humans, if you had a kid with your brother or sister right now nothing would come of it because you (probably) have no long history of inbreeding in your family. Genetic mutations becomes more likely with inbreeding over a span of several generations. Inbreeding does not cause genetic mutation, it simply increases the probability that it will happen.
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