Final answer:
The same mutation causing the short-legged phenotype in different unrelated breeds likely occurred independently in each breed, suggesting that it is recent and artificial and not a characteristic that wolves had.
Step-by-step explanation:
The same mutation causing the short-legged phenotype in different unrelated breeds tells us that the mutation likely occurred independently in each breed. This suggests that the mutation is not a characteristic that wolves had, but rather a result of separate breeding practices in each breed. The presence of the same mutation in different breeds also suggests that the mutation is recent and artificial, as it is not a trait that was present in the ancestral wolf-like population.