Here is the item again:
To keep her basset hound away from the pizza, Ana keeps the squirt bottle within reach. So that she can "draw" like a gunslinger if a dog tongue gets too close.

You chose to use Punctuation Rule 1 to fix the problem:

Main Clause + Ø + Subordinate Clause.

Here is the correction:

To keep her basset hound away from the pizza, Ana keeps the squirt bottle within reach so that she can "draw" like a gunslinger if a dog tongue gets too close.

Great work! You deserve every spoonful of that cyber sundae!

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