1. Grapes -- The toxicity of grapes to dogs was once thought to be an urban legend, but it's true; even a small serving can cause vomiting and diarrhea, while larger amounts can lead to kidney failure. Researchers aren't yet sure what exactly causes this reaction, whether pesticides or a fungal toxin.  And while keeping the grapes and raisins in your pantry away from your dog is a concern, you should be on the lookout for grapevines outside as well. As any dog owner knows, berries and fruits of all sorts are a tempting treat.  2. Mushrooms -- While there are plenty of great-tasting, perfectly safe mushrooms out there, dogs just don't seem capable of discerning the difference between the edible and the toxic. To be on the safe side, it's best not to allow dogs to eat any wild mushrooms at all, unless you can confidently identify the species yourself.  Amanita, Galerina and Lepiota species are especially dangerous because they contain toxins that cause a series of worsening symptoms, from vomiting to swelling in the brain. Amanita phalloides, the Death Cap mushroom, is responsible for most of the reported fatal mushroom poisoning cases in dogs.  3. Marijuana -- For most people, the likelihood of your pet gaining access to marijuana -- whether on a live plant or not -- is relatively low. But regardless of your view of marijuana's safety for human use, it has absolutely no benefits for your pet.  After ingesting marijuana, a dog can experience symptoms like slow heart rate, lack of coordination, disorientation, drooling and tremors that can persist for up to three days.  4. Lilies -- While lilies are well-known as a serious danger to cats, certain varieties are highly toxic to dogs as well.
It's often said that the way to a dog's heart is through its stomach.That may be true, but the combination of a voracious appetite, natural curiosity and indiscriminate taste can lead to trouble for