Why does inbreeding cause deformed puppies?

Lack of genetic diversity. When you are faced with a small population, any population such as a secluded herd of sheep on one small mountain peak, they eventually run out of different partners to pair up with. So eventually you have brothers and cousins interbreeding.

It is actually natural in small populations especially ones that are endangered. However when it comes to dogs people breed them for certain traits and temperments and forget about the generations and relationships among their breeders. So they end-up inbreeding.

They think it will produce better puppies with cuters faces, better stances, or longer noses. When this happens you are limiting the gene pool or limiting the genetic diversity amoung your population. So instead of the perfect puppy you end up with genetic deformities or anomolies popping up in the DNA.

This does happen naturally, and explains why there are genetic disorders in humans, it is not always inbreeding, however when certain pieces of genetic code ... more.

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