10 Foods That Are Bad for Dogs

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Chocolate: Chocolate contains theobromine and caffeine, which can be toxic to dogs. Dark chocolate and cocoa powder are especially dangerous.

Grapes and Raisins: Grapes and raisins can cause kidney failure in dogs, even in small amounts. Symptoms may include vomiting, diarrhea, lethargy.

Onions and Garlic: Onions and garlic, whether raw, cooked, or in powdered form, contain compounds that can damage a dog's red blood cells and lead to anemia.

Avocado: Avocado contains persin, which can be toxic to dogs in large amounts. While the flesh itself may not be as harmful, the pit and skin pose a choking hazard.

Xylitol: Xylitol is a sugar substitute found in many sugar-free products, including gum, candy, baked goods, and toothpaste. Ingestion of xylitol can cause a rapid release of insulin in dogs.

Alcohol: Alcohol is toxic to dogs and can cause intoxication, vomiting, diarrhea, difficulty breathing, tremors, coma, and death. 

Macadamia Nuts: Macadamia nuts contain a toxin that can affect a dog's nervous system, muscles, and digestive system.

Bones: Cooked bones, especially those from poultry or fish, can splinter and cause choking, gastrointestinal obstruction, or perforation in dogs.

Caffeine: Like chocolate, caffeine is a stimulant that can cause toxicity in dogs. Ingestion of caffeine-containing products such as coffee, tea, energy drinks.

Dairy Products: While small amounts of plain, unsweetened dairy products like plain yogurt or cheese may be tolerated by some dogs, many dogs are lactose.