People take their allergies very seriously these days, and if you try to feed them something they can't eat the militantly allergic will attack, and trust me- you don't want that.
It's even worse when your cat or dog is trying to tell you the food you bought ain't agreeing with them, because they can't express themselves with words- only violence.
Better to heed the warning set forth by this Cheekylicious comic and consult your cats and dogs about any special diets they may have before you feed them!
-Via Geeks Are Sexy