FACT: While some human foods are beneficial to dogs, such as eggs, yogurt (some dogs may be lactose intolerant), flaxseed, chicken liver, and green beans, some are actually poisonous. For instance, chocolate can cause Theobromine poisoning and be fatal – even a small amount can cause lethargy, vomiting, and diarrhea. Onions fed over a long time can cause anemia. Bones can cause choking, internal punctures and, in some cases, even death. Macadamia nuts can cause indigestion, and grapes and raisins are known to cause kidney failure. So feed human foods to dogs with caution.