Sometimes additional preservatives are used to expand their shelf life, but if you search carefully you can find options without them. (mydoglikes.com)
For our canned diets, the manufacturing (or retort) process sterilizes the food and removes all air, thus there is no need for additional preservatives. (instinctpetfood.com)
With an eye to the future, the company plans to expand its policies related to food simplicity, transparency and choice in coming months, to complement its stated goal of eliminating additional preservatives and additives where possible by end of 2017. (tacobell.com)