This is a test of commonsense. Complete the next sentence:

How to keep dog food fresh
Open the bag carefully.
Many dog food bags are made to have food stored directly in them. Open the bag carefully along the top seam or dotted line so that you can fold and roll the bag later.
If the bag comes with a zipped top, open carefully above the seal to keep it intact for later. Use scissors or a knife to get a clean, consistent opening from the bag.