dog breeds: same species or not

As an argument against evoluiton, it was pointed out that
with all massive human activity at breeding animals and plants,
no new species was ever created as a result of domestication and
artificial breeding.

I want to ask: large dogs like St.Bernads, and smallest dogs like
Chihuahua... can they mate naturally between themselves, can they ?

I think they can't, based on their enormous size difference.

Does this not make them different species -- large dogs vs small
dogs ?
Ability to mate is most important aspect of a telling species apart,
no ?

Thanks
Y.L.

.

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