More Plants Toxic to Dogs:  

The following list of potentially hazardous plants is in no way complete; however, it does represent the most commonly kept plants. Accurate identification of the plant in question is essential. Local floral shop and plant nursery personnel are valuable sources of information regarding plant identification.

Aloe Vera (Medicine Plant)
Amaryllis
Apple (seeds)
Apple Leaf Croton
Apricot (pit)
Asparagus Pern
Autumn Crocus
Avocado (fruit & pit)
Azalea
Baby's Breath
Bird of Paradise
Bittersweet
Branching Ivy
Buckeye
Buddhist Pine
Caladium
Calla Lily
Castor Bean
Caiman
Charming Dieffenbachia
Cherry (seeds & wilting leaves)
Chinese Evergreen
Christmas Rose
Cineraria
Clematis
Cordatum
Corn Plant
Cornstalk Plant
Croton
Cuban Laurel
Cutleaf Philodendron
Cycads
Cyclamen
Daffodil
Devil's Ivy
Dieffenbachia
Dracaena Palm
Dragon Tree
Dumb Cane (Dieffenbachia)
Easter Lily (especially cats)
Elaine
Elephant Ears
Emerald Feather
English Ivy
"Exotica Perfection"
Fiddle-leaf Fig
Florida Beauty
Foxglove
Fruit Salad Plant (Philodendron Pertusum)
Geranium
German Ivy
Giant Dumb Cane
Glacier Ivy
Gold Dieffenbachia
Gold Dust Dracaena
Golden Pothos
Halm's Self-Branching English Ivy
Heartleaf Philodendron
Hibiscus
Holly
Horsehead Philodendron
Hurricane Plant
Indian Laurel
Indian Rubber Plant
Janet Craig Dracaena
Japanese Show Lily (especially cats)
Jerusalem Cherry
Kalanchoe (Panda Bear Plant)
Lacy Tree Philodendron
Lily of the Valley
Madagascar Dragon Tree
Marijuana
Marble Queen
Mexican Breadfruit (SplitLeaf Philodendron)
Miniature Croton
Mistletoe
Morning Glory
Mother-in-Law's Tongue
Narcissus
Needlepoint Ivy
Nephthytis
Nightshade
Oleander
Onion
Oriental Lily (especially cats)
Peace Lily
Peach (wilting leaves & pits
Pencil Cactus
Plumosa Fern
Poinsettia (low toxicity)
Poison Ivy
Poison Oak
Pothos
Precatoiy Bean
Primrose (Primula)
Red Emerald
Red Princess
Red-Margined Dracaena
Rhododendron
Ribbon Plant
Saddle Leaf Philodendron
Sago Palm
Satin Pothos
Schefflera
Silver Pothos
Spotted Dumb Cane
String of Pearls/Beads
Striped Dracaena
Sweetheart Ivy
Swiss Cheese Plant
Taro Vine
Tiger Lily (especially cats)
Tomato Plant (green fruit,stem & leaves)
Tree Philodendron
Tropic Snow Dieffenbachia
Variegated Philodendron
Variegated Rubber Plant
Warneckei Dracaena
Weeping Fig
Yew

Copied and Pasted from a paper distributed by Ralston Purina Company.
There are some that are on my previous list.