To put it in few words, although it may not seem at first, feeding your rabbit cat food could have disastrous health effects. As we previously stated, cats and dogs are mainly carnivorous animals, while rabbits are herbivorous animals.They mainly eat fresh fruits, veggies, and seeds. Their digestive systems are not designed to cope with animal fats and carbohydrates, so feeding your rabbit dog or cat food can seriously damage their health.Excessive intake of proteins can lead to kidney failure in rabbits while excessive fats and carbs will easily lead to obesity and heart affections.