When I was little, about 5-ish, I tried eating my cats' biscuits on several occasions. I wasn't sure what to make of them at first. I liked the saltiness but some of the other ingredients tasted very strange indeed. So I kept trying them til I made up my mind that...yes, they tasted bad to humans. Lol. Also, I didn't want to take food away from my cats. XD
The other animal food I have eaten is when I used to ride horses and we would make this meal for them called 'Mash' in winter in a big feed bucket. It smelled heavenly, was warm and kind of like a gruel for them with extra vitamins and minerals. It contains things like chaff and oats, if I remember correctly. On several occasions I tried some of that but it didn't taste nearly as nice as it smelled. I also tried the little pellets we used to feed them. Hee hee.