How are chihuahuas and St. Bernards the same species?
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They are close genetic relatives and can – with some difficulty – produce viable offspring.
Arguably even *wolves* and chihuahuas are the same species (some classifications list dogs as their own species, and some list them as a subspecies of wolf). Like most biological classifications, these lines can be a bit fuzzy around their boundaries, but all dogs are quite closely related to one another (their last common ancestor is only a matter of thousands of years ago, which is much more recent than it is for most species).
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