Difference Between Artificial Selection and Natural Selection?

As far as I understand it. Natural Selection works by mutations over time that fill the gene pool that allows a species to better adapt in order to survive. While artificial selection such as dog breeding uses the gene pool that is currently in a species and tries to filter out the unwanted genes in order to achieve a set goal.

I was reading an article about how after a certain point, you cannot breed a dog any further because their is little to no genetic variation in the breed, such as if you try to breed other traits from a poodle you will not be able to unless you introduce more variation such as another breed.

Do I have these ideas correct?

also

Will a breed such as poodles ever increase their own gene pool through genetic mutation if no other breed was introduced to the mix?
 
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