
I'm discovering new things on this list all the time. Perhaps people feed these foods to their dogs unknowingly...I've been guilty of this in the past. Here's a comprehensive list of things you shouldn't feed. If you see that I missed anything, let me know, or just add it to the bottom :)
SOURCE* http://www.aspca.org/pet-care/poison-control/a-poison-safe-home.html
Foods to Avoid Feeding Your Pet
* Alcoholic beverages
* Avocado
* Chocolate (all forms)
* Coffee (all forms)
* Fatty foods
* Macadamia nuts
* Moldy or spoiled foods
* Onions, onion powder
* Raisins and grapes
* Salt
* Yeast dough
* Garlic
* Products sweetened with xylitol
Warm Weather Hazards
* Animal toxins—toads, insects, spiders, snakes and scorpions
* Blue-green algae in ponds
* Citronella candles
* Cocoa mulch
* Compost piles Fertilizers
* Flea products
* Outdoor plants and plant bulbs
* Swimming-pool treatment supplies
* Fly baits containing methomyl
* Slug and snail baits containing metaldehyde
Medication
Common examples of human medications that can be potentially lethal to pets, even in small doses, include:
* Pain killers
* Cold medicines
* Anti-cancer drugs
* Antidepressants
* Vitamins
* Diet Pills
Cold Weather Hazards
* Antifreeze
* Liquid potpourri
* Ice melting products
* Rat and mouse bait
Common Household Hazards
* Fabric softener sheets
* Mothballs
* Post-1982 pennies (due to high concentration of zinc)
Holiday Hazards
* Christmas tree water (may contain fertilizers and bacteria, which, if ingested, can upset the stomach.
* Electrical cords
* Ribbons or tinsel (can become lodged in the intestines and cause intestinal obstruction—most often occurs with kittens!)
* Batteries
* Glass ornaments
Non-toxic Substances for Dogs and Cats
The following substances are considered to be non-toxic, although they may cause mild gastrointestinal upset in some animals:
* Water-based paints
* Toilet bowl water
* Silica gel
* Poinsettia
* Cat litter
* Glue traps
* Glow jewelry
I've also heard rumors that sugar, bleached flour (which immediately converts to sugar), rawhide bones and smoked pigs ears, and other products can cause cancer in dogs due to the way the dog's digestive system processes these foods, or due to the way the food is prepared.
I've noticed A LOT of dog treats, even "organic" ones contain garlic. This is not good because Onions, garlic and chives in all forms (dry, raw, cooked) contain thiosulphate, which can irritate the gastrointestinal system of your dog. A relatively high dosage (600-800 grams) in one meal or spread apart over a few days can damage red blood cells (haemolytic anemia).
Perhaps I'm over reacting here, but Roger is my first dog (who I am the primary caretaker for), and I just don't want him to suffer on account of my ignorance. Maybe it's just a placebo effect, but I feel better knowing that I'm not feeding these foods to my little guy.