4. Onions & Garlic
Onions and garlic are everywhere — pasta sauce, pizza, soup, leftovers, baby food, takeout. It does not matter if they are raw, cooked, powdered, or dried. All forms are toxic to dogs. Powdered versions are even more concentrated.
The chemicals attack red blood cells and cause anemia — weakness, pale gums, fast heartbeat. Symptoms can take days to show up. Your dog might steal garlic bread Monday and seem fine until Thursday. No human leftovers with sauce or seasoning. Plain rice and chicken? Fine. Pizza crust? Skip it. The next one has a bizarre effect on dogs.