Purina advises that you might consider microwaving wet foods (out of the can) for a short time. But avoid serving food that is either too hot or too cold. So, there are owners who warm their dog's chilled food to simply bring it back to room temperature or slightly above.
Should dry dog food be left out all day?
Leaving out kibble all day may lead to a loss of aroma. Dogs may turn their noses down to stale food that doesn't smell fresh and may get picky about eating it. For this reason, several dog owners place kibble inside airtight sealed containers so to preserve freshness.
How do you store canned dog food after opening?
Store opened cans of wet dog food in the fridge. The best way to keep them moist and stop odor from transferring to other food is to use a plastic pet food lid designed to fit the top of the can. If you don't have one of those, you can use plastic wrap or a zip-seal bag, but those don't trap odors as well as a lid.
How long does dog food last once opened?
within 6 weeks