poison prevention for pets
Pet Care July 11, 2016

Poison Prevention: Plants Poisonous to Dogs and Cats

It’s spring, the glorious time of year when the weather warms up and your local greenhouse is packed with gardening enthusiasts collecting seeds and plants for the garden or windowsill. Unfortunately, a lot of plants are toxic to pets. The ASPCA Poison Control hotline receives thousands of calls every year from pet owners seeking help with accidental poisoning from plants, and lawn and garden products. To keep your pets safe, learn to identify plants poisonous to dogs and cats, and avoid planting them where curious pets roam.

Aloe:  Aloe Vera. More than 500 species of aloe exist, all containing toxic saponin, which acts as a defense mechanism for the plant. Signs your pet ingested aloe include vomiting, diarrhea, loss of appetite, tremors, and a change in urine color.

Amaryllis: Part of the lily family, it contains the highly toxic lycorine, which will cause your pet vomiting, depression, diarrhea, abdominal pain, hypersalivation, anorexia, and tremors.

Autumn Crocus: Another common name for this pretty, pink flower is the Meadow Saffron. Although it contains colchicine, which is currently being studied as a cancer medication for humans, it is toxic to cats, dogs, and horses. Signs of ingestion include oral irritation, bloody vomiting, diarrhea, shock, multi-organ damage, and bone marrow suppression.

Azalea/Phododendron: Consisting of 250 different species, azaleas are quite common, especially in California. Although small, it is one of the most toxic flowers to cats, dogs, and horses. It contains grayantoxin, which alters skeletal muscle, cardiac muscle, and nerve function. This interaction causes a multitude of side effects which could result in coma and death.

Carnation: Who knew that the most common flower found in bouquets was toxic to dogs and cats? Although the toxic variant is unknown, carnations will cause your pet to have mild dermatitis and demonstrate mild gastrointestinal signs.

Castor Oil Plant: Typically grown in California to produce castor oil, this plant's leaves resemble ivy. Known for its uniquely spiked seed capsules, it contains ricin, which is not only toxic to dogs, cats and horses, but humans as well. Ricin inhibits protein synthesis, and even if your pet consumes as little as one ounce, the effects can be lethal. If not treated immediately, your pet may experience convulsions, which will eventually lead to coma and death.

Chamomile: No matter how relaxing it is for you, don't let your dog, cat, or horse get a hold of your chamomile tea! This flower contains a variety of toxic components and will result in your pet experiencing contact dermatitis, vomiting, diarrhea, anorexia, and allergic reactions.

Chrysanthemum: Often called “mums,” his common garden flower belongs to the daisy family, and is toxic to dogs, cats, and horses. Clinical signs that your pet has ingested chrysanthemum are vomiting, diarrhea, hypersalivation, incoordination, and dermatitis.

Cyclamen: This pretty flower, most commonly known for its vibrant buds and unique contrasting leaves, is toxic to dogs and cats. Small ingestion side effects include diarrhea, vomiting, and salivation. If your pet consumes a large amount, however, your pet will experience heart rhythm abnormalities and seizures, which may eventually lead to death.

Dahlia: Another beautiful flower that is toxic to dogs and cats is the dahlia. Although not as high in toxicity as some of the other plants mentioned, this flower will cause your pet to experience mild gastrointestinal signs and mild dermatitis.

English Ivy: This type of foliage is one of the most commonly used in households. We can see it growing along the sides of walls and fences among our backyards, making it easily accessible to our pets. It is toxic to horses, dogs, and cats and will cause them to experience vomiting, diarrhea, abdominal pain, and hyper-salivation.

Eucalyptus: This plant is commonly used in many oils that we humans use for aromatherapy and skin-care products. If your dog, cat, or horse consumes this plant, however, they will experience salivation, vomiting, diarrhea, depression, and weakness.

Foxtails: Foxtails are not a plant you would purchase, but in certain states, in warmer months they can be seen everywhere. A foxtail is a “spikelet” that grows on certain types of grasses and attaches to your pet with special barbs. A foxtail can work itself under the skin causing internal damage and death.

Gladiolus: Ingesting any part of this plant will cause your pet to experience salivation, vomiting, drooling, lethargy, and diarrhea. However, the highest concentration of its toxic component is in the buds.

Hibiscus:  If your pet eats this tropical-looking flower, they will experience vomiting, diarrhea, anorexia, and nausea.

Holly: This plant, found in many of our holiday decorations, contains a low toxicity in its berries and leaves.  However, it will still cause your dog, cat, or horse to experience vomiting, diarrhea, and depression if ingested.

Kalanchoe: There are over 125 different species of kalanchoe and they all look very different! Kalanchoe is toxic to both dogs and cats and most commonly will cause them to experience vomiting and diarrhea. In rare cases, your pet may experience an abnormal heart rhythm.

Lilies: While flowers derived from the lily family are toxic to many species of animals, the most common lily that we all know and love is toxic to cats only. If your feline ingests this flower, they will experience kidney failure which, if not treated quickly, may result in death.

Marijuana: The Delta-9-THC that exists in marijuana, which causes an altered state of mind in humans, has the same altered-state effect in dogs, cats, and horses; however, this effect is toxic to our pets. You can tell if your animal comes into contact with this common drug by seeing them experience prolonged depression, vomiting, heightened excitement, and/or sleepiness, incoordination, hypersalivation, dilated pupils, low blood pressure, low body temperature, seizures, and a possible comatose state. In rare occasions, ingestion of marijuana has resulted in death.

Milkweed: There are many different species of milkweed; however, this plant is most commonly known for its hollowed filaments covered in wax. It is the plant that is most commonly cultivated for the stuffing in our pillows! Although this plant sounds cute and harmless, it is toxic to dogs, cats, and horses. It will cause them to experience side effects which may result in seizures, difficulty in breathing, weak pulse, dilated pupils, kidney or liver failure, a comatose state, respiratory paralysis and death.

Morning Glory: This beautiful flower contains hallucinogenic alkaloids in its seeds. If ingested, it can cause your pet to experience gastrointestinal upset, agitation, tremors, disorientation, ataxia, and loss of appetite. In some cases it may cause diarrhea. This is one of those plants that you really have to watch out for, because many of these side effects can go unnoticed.

Morning Glories come in over 1,000 varieties.

Mulch: Don't worry, not all fertilizers are toxic to your pets.  Cocoa Mulch, typically sold at many home improvement stores, is toxic.  It contains theobromine, found also in chocolate, and has the same side effects that would occur from the consumption of chocolate.

Oleander: This typical Californian plant, known for its long, stiff leaves, contains a component known as cardiac glyoside, which is toxic to cats, dogs, and horses. Although this component is used in medicine to treat cardiac failure in humans; in pets, cardiac failure may be the result. Signs that your pet has ingested this highly toxic plant are colic, diarrhea (possibly containing blood), sweating, incoordination, difficulty breathing, muscle tremors, the inability to stand, and as mentioned before, cardiac failure which may result in death.

Peace Lily: Popular houseplant and common bouquet filler, the peace lily is known for its single spiky spadex, surrounded by a single white, yellowish, or greenish leaf. If your dog or cat consumes this, you will notice them experiencing oral irritation, intense burning of the mouth, tongue and lips, excessive drooling, vomiting, and difficulty swallowing.

Poinsettias: Although generally over-rated in toxicity, poinsettias contain sap that may cause irritation to the mouth and stomach, and possible vomiting.

Pothos: An ivy plant, most commonly found inside the house as decoration. If your cat or dog ingests this, the side effects include: oral irritation, intense burning and irritation of the mouth, tongue and lips, drooling, difficulty swallowing, and vomiting.

Rubber Plant: Not all rubber plants are toxic to your pets. It depends on the genus and species. Rubber plants from the Peperomia genus are not highly toxic to your pets, however, they may cause a mild stomach ache. Other rubber plants, such as the Japanese Rubber Plant may cause diarrhea, vomiting, depression, and lack of coordination.

Sago Palm: Another plant that many of us use in our landscapes is the Sago Palm. Although difficult to ingest, if your dog, cat, or horse gets a hold of this plant, it could be fatal. Signs of consumption include vomiting, bloody stools, jaundice, increased thirst, hemorrhagic gastroenteritis, bruising, bleeding disorders, liver damage, liver failure, and death.

Schefflera: More commonly known as the Umbrella Tree, this tropical looking plant is toxic to cats and dogs. It contains calcium oxalate crystals, which is a common cause of human kidney stones! This toxic component is found in every part of the tree and will cause your pet to experience oral irritation, excessive drooling, vomiting, difficulty swallowing, and intense burning of the mouth, lip, and tongue.

Shamrocks: Consider your pet unlucky if they get a hold of a shamrock. Although only slightly toxic in small quantities, a large consumption of this plant by your horse, dog, or cat, can produce colic (in horses), and possible kidney failure.

Spinach: Spinach does contain a small amount of calcium oxalates, which could potentially cause the formation of crystals in the urinary tract of an unhealthy cat. If your cat has a history of urinary problems, Popeye's favorite meal should be avoided completely!

String of Pearls/Beads: Known for its white flower buds, with tiny, purple, bead-like structures standing up from the bud, this flower is toxic to cats, and possibly dogs. Symptoms include diarrhea, vomiting, muscle convulsions, loss of appetite, and abdominal sensitivity.  

Tulip/Narcissus Bulbs: Tulips are some of the most common plants that we try to cultivate ourselves. They contain a toxic component called tulipalin A and B which, if consumed, will cause vomiting, depression, diarrhea, and hypersalivation in your dog, cat, or horse. The highest concentration of tulipalin A and B exists in the bulb of the tulip, so keep your furry friends away!

Yew: Used in many Japanese-inspired gardens, this plant is toxic and fatal to horses, dogs, and cats. Onset signs of ingestion include muscular tremors, shortness of breath, and seizures (in dogs). The fatality that may occur from consumption is sudden death from acute cardiac failure.

Yucca: Yucca is native to hot and dry climates in North America. Ingestion of yucca causes different side effects depending on the animal. Dogs and cats will experience vomiting and diarrhea. Grazing animals, like horses, are more susceptible and will experience liver disease and secondary photosensitivity.

Although this list is fairly comprehensive, it’s impossible to list every organic material that might be poisonous to your pet. When in doubt, consult with your local nursery or expert gardener, or do your own research online.


The Michelson Found Animals Foundation's mission of saving pets and enriching lives is made possible by the generous contributions of Dr. Gary Michelson and Alya Michelson.

Read Next Pets as Family: Do You Have a Modern Family? Pets & Family July , 2016