What trait related to specialization highlights a vulnerability for the Lundehund breed today?
Answer
A relatively small gene pool
The intense, focused historical breeding program that refined the Lundehund's unique physical capabilities resulted in the dog possessing a relatively small gene pool in the contemporary era. This genetic bottleneck is cited as a potential vulnerability, as such intense specialization can sometimes correlate with breed-specific health considerations that responsible ownership must manage through vigilance and veterinary partnership. The vulnerability inherent in this high degree of specialization is further emphasized by the fact that the breed nearly disappeared at one point.

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The incredible (and flexible) Norwegian Lundehund | NBC Sports
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