Almonds - Dogs shouldn’t eat almonds as they can cause blockages in the esophagus or if not chewed completely, they can tear the windpipe. Salted almonds are especially dangerous (can increase fluid retention; potentially fatal to dogs prone to heart disease). Chocolate - Dogs should never be given chocolate as it contains toxic substances called methylxanthines. These are stimulants that stop their metabolic process. Even a small piece can cause diarrhea and vomiting. Dark chocolate is the worst. A large amount can cause irregular heart function, seizures, or death. Cinnamon - Cinnamon is not toxic to dogs, but is best avoided as a suggestion on what can dogs not eat. It contains oils that can irritate the mouth, making them uncomfortable and sick. It can also lower their blood sugar leading to diarrhea, vomiting, increased, or decreased heart rate, and even liver disease. In powder form it can cause difficulty breathing, coughing, and choking if inhaled. Garlic - Never give dogs garlic or other Allium plants such as onions, leeks, and chives as it is the worst things to feed a dog. They are all toxic to dogs with garlic being five times more toxic than the rest. It can create anemia in dogs, with side effects such as pale gums, an elevated heart rate, weakness, and collapse. The poisoning can have delayed symptoms, so monitor them for a few days. Ice cream - Dogs shouldn’t eat ice cream as it contains high levels of sugar. Macadamia nuts - Dogs should never be given macadamia nuts as they one of the most poisonous foods for dogs. They can cause vomiting, increased body temperature, inability to walk, and lethargy as well as affecting the nervous system.