evidence: Corn gluten: This type of rodent bait is usually found in disc and pellet forms. Because these discs and pellets look very similar to more toxic baits, do not assume that all brown discs or pellets are corn gluten. This rodenticide causes dehydration and obstruction of the GI tract in rats and mice. In dogs and cats, this usually only causes GI upset, however if a large amount is ingested, the pet can become dehydrated or develop a blockage of the intestine.