17. Nutmeg
This one surprises almost everyone. Nutmeg is toxic to dogs. The culprit is myristicin — in high doses, it causes hallucinations, disorientation, racing heart, and seizures.
A sprinkle on your latte is unlikely to harm a healthy dog. The real danger is baked goods and holiday treats with generous amounts. Watch out for pumpkin pie, eggnog (also has dairy and alcohol — triple threat), spice cake, and holiday cookies. If your dog steals a slice of pie, call your vet. No human baked goods for dogs. The next item is hiding in your backyard.