Dogs (and cats) can become extremely ill or even die from eating poisonous plants. Keep all unknown types of plants and any plants suspected of being poisonous out of reach of your pet, and/or spray with Bitter Apple (for plants).

The following is a partial listing of poisonous plants.  If poisoning is suspected, you should seek veterinary treatment immediately.

Acocanthera -- Fruit and Flowers
Amanita Mushroom
Amaryllis -- bulbs
Amsinckia -- Tarweed (foliage, seeds)
Anemone
Angel Trumpet Tree -- flowers and leaves
Apple Seeds
Apricot Pits & Seed Kernal
Atropa Belladona
Airplane Plant
Avocado Leaves
Azalea

Balsam pear (seeds, outer rind of fruit)
Baneberry
Beach Pea
Betel Nut Palm
Belladonna
Bird Of Paradise -- Seeds
Bittersweet -- Berries
Black-Eyed Susan
Black Locust
Bladder Pod
Bloodroot
Bottlebrush -- Flowers
Boxwood Bleeding Heart
Boxwood Tree
Bluebonnet
Buckthorn -- Fruit, Bark
Buttercup -- Sap, Bulbs

Caladium
Calla Lily
Cardinal Flower
Carolina Jessamine
Cassava -- Roots
Castor Bean -- Leaves, Bean
Chalice vine / Trumpet vine
Cherry Tree -- Everything Except Fruit
Cherry Laurel
Chinaberry Tree -- Berries
Christmas Berry -- Berries
Christmast Cactus -- Sap
Christmas Candle
Christmas Rose
Christmas Tree -- Needles, Tree Water
Common Prive
Columbine
Coral plant
Corn Cockle
Crocus (Autumn) -- Bulbs
Crocus -- Bulbs
Croton
Cyclamen

Daffodil
Daphne -- Berries
Datura / Jimsonweed
Deadly Amanita
Deadly Nightshade
Death Camas
Death Cap Mushroom
Deiffenbachia / Dumb Cane
Destroying Angel / Death Cap
Diffenbachia
Dragon Tree
Dutchman's Breeches
Dogwood -- Fruit

Eggplant -- Foliage
Elderberry -- Foliage
Elephant's Ear / Taro -- Foliage
English Holly Berries
English Ivy
Equisetum
Euphorbia / Spurges

False Hellebore
False Henbane
Fiddleneck / Senecio
Fly Agaric / Amanita
Four O'Clock
Foxglove

Gelsemium
Ghostweed / Snow On The Mountain
Golden chain / Laburnum

Holly Berries (English and American)
Horsechestnut
Horsetail Reed / Equisetum Hyacinth -- Bulbs
Hydrangea -- Flower Buds

Iris -- Bulb
Ivy

Jack-In-The-Pulpit /Indian Turnip
Jasmine
Jasmine Star
Jatropha -- Seeds, Sap
Java bean -- Uncooked Bean
Jerusalem Cherry -- Berries
Jessamine -- Berries
Jimsonweed
Johnson Grass
Juniper -- Needles, Stems and Berries

Laburnum
Lambkill / Sheep laurel
Lantana
Larkpsur
Laurel
Lobelia
Locoweed
Lords and Ladies / Cuckoopint
Lily of the Valley -- All parts of the plant, as well as vase water

Machineel
Mayapple -- All parts, except fruit
Mescal Bean
Milk Vetch
Milkweeds -- Foliage
Mistletoe Berries
Moccasin Flower
Mock orange -- Fruit
Monkshood
Morning glory
Mother-In-Law's Tongue
Mountain Laurel
Mushrooms (many wild forms)

Narcissus -- Bulbs
Narcissus Jonquilla
Natal Cherry
Nicotine Bush
Nightshades

Oak -- Acorns, Leaves
Oleander (very poisonous)

Peach -- Pit
Pear Seeds
Pennyroyal -- Foliage & Flowers
Peony
Periwinkle
Philodendron
Pikeweed
Pine Needles
Poison Hemlock
Poison Ivy
Poison Oak
Poison Sumac
Pokeweed
Pokewood / Poke cherry -- Roots, Fruit
Poppy
Potato plant -- New shoots and Eyes
Privet Shrub

Rattlebox
Rhododendron
Rhubarb Plants
Rosary Peas -- Pods, Seeds, Flowers
Russian Thistle

Sago Palm
Salmonberry
Scarlet Pimpernel
Senecio / Fiddleneck
Skunk Cabbage
Snapdragon
Snowdrop
Spanish Bayonet
Spider Plant
Star Of Bethlehem
Sudan Grass
Sundew

Tansy -- Foliage, Flowers
Tarweed
Thornapple
Tiger Lily
Toad flax -- Foliage
Tobacco Leaves

Tobacco Plants
Tomato Plant -- All parts, except for fruit
Touch-Me-Not
Toyon Berry -- Berries
Trillium -- Foliage
Trumpet Vine
Tulips

Venus Flytrap
Verbena
Virginia Creeper -- Sap 

Water Hemlock
Wildflower
Wild Parsnip -- Roots, Foliage
Wisteria

Yellow Jessamine
Yellow Star Thistle
Yew (American, English and Japanese)