Summary
Natural Selection occurs every day (it is true).
Natural Selection is not evidence that that the Theory of Evolution is true
(remember, the Theory of Evolution teaches you have bacteria ancestors).
Natural Selection shows that "good traits" in a population survive (a good
trait is being a hairy dog in Alaska).
Natural Selection shows that "bad traits in a population are eliminated (a
bad trait is being a hairless dog in Alaska).
Natural Selection deals only with existing traits...it does not create new traits,
nor does it create a new population of animals.
In this example you started with dogs, and ended with dogs...this is not
evidence that you have bacteria ancestors.