Chocolate: Chocolate contains theobromine, a substance that is toxic to dogs.
Grapes and Raisins: Grapes and raisins can cause kidney failure in dogs, and even small amounts can be harmful.
Xylitol: Xylitol is a sugar substitute often found in sugar-free gum, candies, and certain baked goods.
Bones: Cooked bones can splinter and cause obstructions or tears in a dog's digestive system.
Avocado: Avocado contains a substance called persin, which, in large quantities, can be toxic to dogs.
Caffeine: Like chocolate, caffeine is present in various products, including coffee, tea, and energy drinks.
Macadamia Nuts: Macadamia nuts can cause weakness, vomiting, tremors, and hyperthermia in dogs.