·     Alcohol

·     Aspartame

·     Avocados

·     Aloe Vera

·     Baby Food (can contain onion powder)

·     Broccoli in large amounts

·     Chocolate

·     Cigarettes, tobacco, cigars

·     Citrus oil

·     Coffee grounds, coffee beans & tea (caffeine)

·     Fat trimmings (can cause pancreatitis)

·     Garlic in large amounts

·     Hops (used in home brewing)

·     Human vitamins containing iron (can damage the lining of the digestive system)

·     Large amounts of liver

·     Moldy/spoiled foods

·     Mushrooms

·     Macadamia Nuts/Walnuts

·     Nutmeg

·     Onions

·     Pear, plum, peach and apricot pits, apple cores (seeds contain cyanide)

·     Potato peelings and green looking potatoes

·     Raisins and grapes (damages the kidneys)

·     Raw fish

·     Raw Potatoes

·     Rhubarb leaves

·     Salt in large amounts

·     Tomato leaves & stems (green parts)

·     Turkey skin

·     Voltarin (in arthritis medication)

·     Yeast dough

·     Xylitol (in sweetened gum)

Read more in depth detail on some of these foods in the Vet's Advice column by Dr. Tiffany Lennox.