2. Chocolate

Almost everyone knows this rule. But here is what most people miss — not all chocolate is the same. A big dog who steals a milk chocolate cookie? Probably fine. A small dog who finds dark chocolate? Real emergency.
The darker, the more dangerous. Baking chocolate is the worst. The villain is theobromine — humans break it down easily, dogs cannot. Symptoms can take six to twelve hours: shaking, racing heart, restlessness. If your dog eats chocolate, do not wait. The next one might be the scariest on this list.