More than anything else, cat food-eating dogs tend towards the obese and suffer more gastrointestinal ailments than others. Diarrhea, vomiting and even pancreatitis (which can be life-threatening) are possible outcomes for either short- or long-term feeding of cat food to dogs. read more
However, there are certain carnivorous animals -- reptiles, fish, etc. -- that are fed other animals. Some snakes, for example, might be fed live mice or rats. Mice and rats can also be kept as pets, so there might be some ambiguity there. read more
Some cat foods can be contaminated with the microorganism Salmonella that is the most common cause of cat food recalls. The problem often lies with food companies; the FDA has shown contamination in dry pet foods at a rate of 1/5 of 1% (0.21%) as opposed to raw food diets, which may be contaminated at a rate of over 15.5%. read more