One of the biggest battles that animal shelter staff might face is the war waged with mice. If an animal shelter stores their pet food in the paper bags associated with pet food, you are likely to attract mice. Although low on the food chain, mice are a clever species that will thwart your efforts to demonstrate your mastery over their tiny brains.
Pet food should be removed from the paper bags and put into tight sealing containers. Any spillage should be picked up and removed from the area. If you decide to wage a full-out war with your mice, make sure that if you are using a commercial block bait to poison the mice, keep your volunteers away from the food supply area. A volunteer might not recognize the bait for what it is and think that it is a doggie chew toy.
It has always been my policy to not give opened donated food to my animals. Pet food had expiration dates and opened packages expire faster. You can always put donated food in your pet pantry for homeless pet owners. I like to keep my animals on a constant food diet and mixing up their food at each meal with cause intestinal problems.
Never let your pet food be stored for any length of time. Buy what you need and use what you buy. Avoid storing food in moist areas, pet food can quickly circum to moisture and become moldy. Constantly check expirations dates, especially on donated food. If the donated food is given to you in clear plastics baggies, you might consider just throwing it out. Always keep in mind that you are responsible for the animal in your care and you should never take shortcuts.