Here's a good list of foods and plants. Not complete but it's a really good start.
The main food items that are toxic to dogs, and that you should never feed, are:
Chocolate and caffeine:
http://www.peteducation.com/article....articleid=2238
Onions:
http://www.peteducation.com/article....articleid=2414
Grapes/raisins:
http://www.peteducation.com/article....articleid=2409
Avocados: Toxin is persin which causes gastrointestinal irritation, vomitting and diarrhoea. Can be fatal, but toxic dose is unknown.
The pits of most fruits: Usually contain cyanide
Macadamia Nuts:
http://www.peteducation.com/article....articleid=2411
Mushrooms:
http://www.peteducation.com/article....articleid=2413
Products sweetened with xylitol:
http://www.aspca.org/site/PageServer...ets_poisonsafe
Common toxic plants include:
Aloe
Amaryllis
Andromeda Japonica
Asian Lily (Liliaceae)
Asparagus Fern
Australian Nut
Autumn Crocus
Avocado
Azalea
Bird of Paradise
American Bittersweet
European Bittersweet
Branching Ivy
Buckeye
Buddist Pine
Caladium
Calla Lily
Castor Bean
Ceriman (aka Cutleaf Philodendron)
Charming Diffenbachia
Chinaberry Tree
Chinese Evergreen
Christmas Rose
Clematis
Cordatum
Corn Plant (aka Cornstalk Plant)
Cornstalk Plant (aka Corn Plant)
Cutleaf Philodendron (aka Ceriman)
Cycads
Cyclamen
Daffodil
Day Lily
Devil's Ivy
Dumb Cane
Deadly Nightshade (See Nightshade)
Easter Lily
Elephant Ears
Emerald Feather (aka Emerald Fern)
Emerald Fern (aka Emerald Feather)
English Ivy
Fiddle-Leaf Philodendron
Flamingo Plant
Florida Beauty
Foxglove
Fruit Salad Plant
Glacier Ivy
Gladiolas
Glory Lily
Gold Dieffenbachia
Gold Dust Dracaena
Golden Pothos
Green Gold Nephthysis
Hahn's self branching English Ivy
Heartleaf Philodendron
Heavenly Bamboo
Holly
Horsehead Philodendron
Hurricane Plant
Hyacinth
Hydrangea
Iris
Japanese Show Lily
Japanese Yew (aka Yew)
Jerusalem Cherry
Kalanchoe
Lace Fern
Lacy Tree
Lily of the Valley
Macadamia Nut
Madagascar Dragon Tree
Marble Queen
Marijuana
Mauna Loa Peace Lily (aka Peace Lily)
Mexican Breadfruit
Mistletoe "American"
Morning Glory
Mother-in-Law
Narcissus
Needlepoint Ivy
Nephthytis
Nightshade
Oleander
Onion
Orange Day Lily
Panda
Peace Lily (aka Maana Loa Peace Lily)
Philodendron Pertusum
Plumosa Fern
Precatory Bean
Queensland Nut
Red Emerald
Red Lily
Red-Margined Dracaena (aka Straight-Margined Dracaena)
Red Princess
Rhododendron
Ribbon Plant (Dracaena sanderiana)
Rubrum Lily
Saddle Leaf Philodendron
Sago Palm
Satin Pothos
Schefflera
Spotted Dumb Cane
Stargazer Lily
Striped Dracaena
Sweetheart Ivy
Swiss Cheese Plant
Taro Vine
Tiger Lily
Tomato Plant
Tree Philodendron
Tropic Snow Dumbcane
Tulip
Variable Dieffenbachia
Variegated Philodendron
Warneckei Dracaena
Wood Lily
Yesterday, Today, Tomorrow
Yew (aka Japanese Yew)
Yucca
That is not an exhaustive list. But simply those plants frequently encountered that are problematic. For more information on how each plant affects pets and clinical signs to look out for, visit
ASPCA Animal Poison Control Center: Toxic Plant List