The Drinks:
Alcohol
Coffee (grounds, beans, and chocolate-covered espresso beans)
Tea (because it contains caffeine)
The Fruits and Nuts:
Apple seeds
Apricot pits
Cherry pits
Grapes
Macadamia nuts
Peach pits
Raisins
Rhubarb leaves
Walnuts
The Veggies:
Avocados
Garlic
Hops (used in home beer brewing)
Moldy foods
Mushroom plants
Mustard seeds
Onions and onion powder
Potato leaves and stems (green parts)
Tomato leaves and stems (green parts)
The Other Stuff:
Candy (particularly chocolate—which is toxic to dogs, cats, and ferrets—and any candy containing the toxic sweetener Xylitol)
Gum (can cause blockages and sugar free gums may contain the toxic sweetener Xylitol)
Salt
Xylitol (artificial sweetener that is toxic to pets)
Yeast dough