The whole point of making homemade biscuits is not to use preservatives. It is healthier that way. My two daughters own a dog bandana business and they go to fairs and dog walks. They also sell a lot of homemade dog biscuits at these events. My daughter keeps them in the fridge at home. This keeps them fresh and they don't mold because this is what happens to them if they don't have preservatives in them and are not kept cool. You can also freeze them if you make a big batch which is what they do. Then take out what you need. They thaw quickly. So, my advice is. Don't use any preservatives just love and put them in a zip bag and fridge them.
I have never heard of using a preservative in dog biscuits but I would google it, look at all the recipes and then decide from there which to make, etc. I have seen lots of recipes on line for making your own cat and dog food which is FAR healthier than that bought at stores, and none of these have any preservatives in them.
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