If you buy large boxes of treats, it can be tempting to stash some in the freezer until you’re ready to use them. But that may negatively affect a treat's quality. According to Pedigree, dry dog food that is frozen then thawed can cause mold to develop. It’s possible the same thing could happen with dry treats.  Hodges says she doesn’t suggest freezing dog treats unless they are meant to be, such as frozen cup-style treats from Yoghund YoPups or Purina Frosty Paws.   “Most dog treats will have an expiration date on the package; don’t feed them after that date, and discard any treats that smell ‘off’ to you—even if they are still within the labeled date range,” Hodges says. “Use common food safety practices with treats—after dispensing treats, reseal the package or transfer the treats to an airtight container to avoid the possibility of oxidation causing rancidity of oils and the growth of toxic molds.”