We've gotten from a wolf to a small breed such as a chihuahua. So the question is: can we go even further and have a dog as small as a thumb (adult dog)?

If not, what are the factors that limit the smallest size of a dog breed? Is it limitations in genetics, or some physiological reasons which would prevent such small dog to survive?

  • $\begingroup$ I'm not sure answers to this question would need to be opinion based, so I'm voting to reopen it....It asks for a biological explanation and not conjecture. Even if the answer is "we don't know", the question could still receive a valid, and informed response. $\endgroup$ – theforestecologist Jan 8 at 15:51
  • $\begingroup$ alternatively, I'm assuming you could rephrase your question to ask specifically what genes control dog size or perhaps a question that asks about a specific physiological limitation. $\endgroup$ – theforestecologist Jan 8 at 15:51
  • $\begingroup$ You may be interested in this essay. $\endgroup$ – NatWH Jan 8 at 16:04
  • $\begingroup$ How long do you have, and how many individuals? The problem seems to be that very small dogs (and purebred dogs in general) tend to have lots of health problems, so it would take many generations of many individuals to weed those out. $\endgroup$ – jamesqf Jan 8 at 19:38

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