Dept of Ag in our state too. And you may be required to have a certified nutrition analysis and label too.
If you think you will be in trouble for making a person sick, Hell hath no fury like a dog lover with a sick dog from food contamination. Be sure to have proper liability insurance and I would have a certified allergy label too.
This is serious stuff. I grew up in this industry and our friend owned Iams Pet Food. My dad manufactured the first ever athletic feed for horses. He was sued when a horse got sick and died. After about two years, an autopsy by VA Tech vets immediately after death on site (paid by him), lawyers, and multi thousands of dollars, it was found that the horse was overfed and the feed was fine. So be aware that this market is much more likely to litigate and find proper blame later. That lawsuit cost him about $25,000 to be not guilty. We owned a feed company. Every time an animal gets sick, the first thing any owner looks at is the feed... from chickens to cows, to horses, to pets.
I wouldn't touch animal treats with a ten foot pole. And you will probably find many more regulations governing this industry than dealing with human food.