Plants That Are Poisonous to Pets

Many species of plants are poisonous. Refer to ASPCA for a more complete list.
Amaryllis
Toxin: alkaloids, mild
Plant part: bulbs
Causes: gastroenteritis
Species affected: dogs and cats
poisonous houseplants
Perdue plant site
Apple/ almond/ apricot/cherry/ peach/plum trees
Toxin: Cyanide, severe
Plant part: every thing but the fruit
Causes: death
Species affected: dogs, cats and horses
Colorado State plant site
University of Tennessee
Black Walnut
Toxin: juglone, moderate
Plant part: nuts, bark and wood
Causes: laminitis in horses
Species affected: dogs, cats and horses
Canadian plant site
Colorado State plant site
Castor bean
Toxin: ricin, severe
Plant part: seeds
Causes: severe diarrhea, death
Species affected: dogs, cats and horses
Canadian plant site,
Alabama extension plant site
Colorado State plant site
Chrysanthemum
Toxin: Pyrethrin, mild
Plant part: leaves and stems
Causes: Dermatitis
Species affected: dogs, cats and horses
Canadian plant site
poisonous houseplants
Daffodils and other flower bulbs
Toxin: alkaloids, mild
Plant part: bulb and leaves
Causes: gastroenteritis
Species affected: dogs, cats and horses
Colorado State plant site
Perdue plant site
Easter Lily
Toxin: unknown, severe
Plant part: entire
Causes: digestive and kidney problems, death
Species affected: cats
Colorado State plant site
Perdue plant site
Hydrangea
Toxin: cyanide, severe
Plant part: flower buds
Causes: abdominal pain
Species affected: dogs, cats and horses
Canadian plant site
poisonous houseplants
Iris
Toxin: Pentacylic terpenoids, mild
Plant part: leaves and rhizomes
Causes: gastroenteritis
Species affected: dogs and cats
Perdue plant site
Ivy
Toxin: hederasaponins and others, severe
Plant part: leaves and fruit
Causes: difficulty breathing, convulsions, coma
Species affected: dogs, cats and horses
Canadian plant site
poisonous houseplants
Jasmine
Toxin: glycoside, severe
Plant part: entire
Causes: chronic wasting, death
Species affected: dogs, cats and horses
Colorado State plant site
Jessamine
Toxin: alkaloids, severe
Plant part: entire plant
Effects: difficulty breathing, convulsions and death
Species affected: dogs, cats and horses
Colorado State plant site
Lantana or yellow sage
Toxin: several, severe
Plant part: leaves, berries
Causes: severe gastroenteritis, death
Species affected: dogs, cats and fish
Canadian plant site,
Alabama extension plant site
Colorado State plant site
Oleander
Toxin: glycosides, moderate
Plant part: entire
Causes: gastroenteritis
Species affected: dogs, cats and horses
Alabama extension plant site
Colorado State plant site
University of Tennessee
Philodendron
Toxin: calcium oxalate raphides, moderate
Plant part: leaves
Causes: mouth irritation and dermatitis
Species affected: dogs and cats
poisonous houseplants
US Army Center for Health
Poinsettia
Toxin: unknown, mild
Plant part: sap in leaves and stems
Causes: rash and nausea
Species affected: dogs and cats
Perdue plant site
poisonous houseplants
Pothos
Toxin: calcium oxalate raphides, mild
Plant part: whole plant
Causes: dermatitis and diarrhea
Species affected: dogs and cats
US Army Center for Health
Rhododendron, azalea
Toxin: grayanotoxin, severe
Plant part: all
Causes: internal hemorrhaging, death
Species affected: dogs, cats and horses
poisonous houseplants
Colorado State plant site
Sweet pea
Toxin: beta-aminoproprionitrile, severe
Plant part: entire plant
Causes: paralysis, convulsions, death
Species affected: dogs, cats and horses
Canadian plant site
Yew
Toxin: taxine, an alkaloid, severe
Plant part: entire plant
Effects: death
Species affected: dogs, cats and horses
Canadian plant site
Colorado State plant site
Photos and lists of poisonous plants

ASPCA

toxic plants

Humane Society


Information about poisonous plants

Facts about poisonous plants

Cornell plant site

Canadian plant site
poisonous houseplants

Alabama extension plant site

Colorado State plant site

University of Tennessee

Perdue plant site

US Army Center for Health