One of the main concerns with dogs eating cat food is taurine deficiency. Taurine is an amino acid that is essential for dogs, but it is not found in high levels in cat food.
Cat food also contains high levels of phosphorus, which can be harmful to dogs. Too much phosphorus can lead to kidney problems and bladder stones.
In addition to taurine and phosphorus, cat food may also be missing other nutrients that are essential for dogs, such as vitamin A, vitamin D, and calcium.
Cat food is typically higher in calories than dog food, which can lead to weight gain in dogs.
Dog's digestive systems are not designed to digest cat food, which can lead to digestive problems such as diarrhea and vomiting.
Dogs can also develop allergic reactions to cat food. Symptoms of an allergic reaction can include itching, skin rash, and hives.
Some cat foods contain ingredients that are toxic to dogs, such as onions and garlic.