Dogs can eat cat food occasionally without toxicity, as cat food is not poisonous to dogs. However, it is not recommended to feed cat food to dogs regularly because cat food has a higher protein and fat content tailored for cats, which have different nutritional needs than dogs. Eating cat food frequently can cause gastrointestinal upset, obesity, pancreatitis, and nutrient imbalance in dogs. It is best to keep cat food out of a dog's regular diet and feed them food formulated specifically for dogs to maintain their health.