With its stiff fronds, the sago palm looks like a tiny palm tree and can live indoors or outdoors. It's toxic to all pets, says Laura Stern, DVM, DABVT, director of client programs for the ASPCA Animal Poison Control Center.

Symptoms include:

• Vomiting
• Diarrhea
• Seizures
• Liver failure
• Potentially death

And while the leaves and bark will harm your pup, “the seeds or ‘nuts’ contain the largest amount of toxins,” Dr. Stern says.

Tulips are spring-blooming flowers that many people love to have in their home—indoors and outdoors. Dog parents should skip these brightly colored flowers, though.

If your dog chews on the lance-shaped leaves, they could get an upset stomach. However, the real danger lies when your dog digs up and eats the newly planted bulbs, which have the most toxins.

According to Dr. Stern, tulip bulbs can cause:

• Stomach upset
• Depression
• Loss of appetite

With large ingestions, dogs may also experience:

• Increased heart rate
• Difficulty breathing

There are a ton of reasons why lilies of the valley are such popular garden plants: They are sweet-smelling; they have adorable, little white bell-shaped flowers; and they can thrive in shady places. But though they may be pretty, lilies of the valley are poisonous to dogs.

“Even a small exposure to any part of the plant can cause heart problems for dogs—changes in heart rate and rhythm,” Dr. Stern warns.

Eating a few leaves or bulbs can also lead to the following symptoms:

• Diarrhea
• Vomiting
• Low blood pressure
• Disorientation
• Seizures
• Coma
• Arrhythmia (irregular heartbeat)

Oleander is a common landscaping plant, especially on the West Coast. This bushy shrub can grow as high as 12 feet, and it’s prized for its cluster of flowers in shades of yellow, white, pink, and red.

Every inch of this plant is poisonous to dogs—from the flower petals to the pointy, long leaves.

“Like lily of the valley, oleander also contains cardiac glycosides,” Dr. Stern explains, adding that symptoms can include:

• Changes in heart rate and heart rhythm
• Diarrhea
• Abdominal pain
• Drooling and excess salivation
• Possible death

Philodendrons have heart-shaped leaves and long vines, and are a very popular houseplant. Beware, though: These plants contain insoluble calcium oxalate crystals, which can irritate your dog’s mouth and lips.

If they’ve swallowed some leaves, other symptoms include:

• Pawing the mouth
• Drooling
• Retching

You see these flowering shrubs in many back and front yards across the country.

All parts of these flowering beauties contain grayanotoxin, and the reaction your pup gets depends on how much they’ve eaten.

“The most common sign with the ingestion of azaleas is stomach upset,” Dr. Stern says.

It’s very rare for dogs to eat a lot of azaleas, but when they do, they can get:

• Very weak
• Tremors
• Low blood pressure
• Irregular heart rate and rhythm

These mostly indoor plants have lush green leaves with white spots or stripes. If your dog nibbles on the leaves, they’re likely to feel as if their mouth, tongue, and lips are burning, thanks to the calcium oxalate crystals (the same ones found in philodendrons).

According to Ann Hohenhaus, DVM, DACVIM, a veterinarian at Animal Medical Center in New York City, other symptoms include:

• Drooling
• Vomiting
• Difficulty breathing

These plants look like small evergreen trees or shrubs with needle-like leaves and small red berries. You can find them throughout the United States.

While the berries aren’t toxic to dogs, the leaves, seeds, and bark are.

According to Dr. Stern, they can cause:

• Vomiting
• Lethargy
• Wobbly gait
• Heart and blood pressure changes, which can be life threatening

Other early warning signs your dog may display include seizures and muscle tremors.

With intensely colored blooms (think every shade of pink) that last a long time, cyclamen is a popular houseplant, especially in the winter.

If your pup eats any part of the plant, they’re likely to:

• Drool
• Vomit
• Have diarrhea

If they dig up the plant and gobble up the roots (or tubers as they’re known), it can affect their heart rate and rhythms, and may even cause death, Dr. Hohenhaus says.

A lantana plant is a shrub that brims with colorful, cluster-like flowers, and it’s toxic to dogs and cats. Your pet’s reaction may depend, in part, on the ripeness of the berries they’ve eaten.

If eaten by your dog, the unripe berries of a lantana can have severe effects. “In very large ingestions, you can see coma and death,” Dr. Schmid warns. Ripe berries, on the other hand, typically only cause vomiting and diarrhea.

Symptoms include:

• Vomiting
• Diarrhea
• Dilated pupils
• Difficulty walking
• Lethargy
• Coma
• Death

In varying shades of blue, pink, and purple, hydrangeas, with their large flower clusters, are certainly pretty from afar. But this plant is toxic to both dogs and cats.

Even though all parts of the plant are toxic, Renee Schmid, DVM, DABT, DABVT, director of veterinary medicine and senior veterinary toxicologist at the Pet Poison Helpline, says that only GI upset will likely result.

Symptoms include:

• Vomiting
• Diarrhea
• Decreased appetite

As perennial plants that live in shaded areas, hosta plants, with their lush, vibrant leaves, are toxic to dogs and cats alike.

Jennifer Kendall, DVM, DABT, DABVT, senior toxicologist at the ASPCA Animal Poison Control Center, explains that all parts of the plant contain something called saponins, which can irritate the intestinal tract.

Symptoms include:

• Vomiting
• Diarrhea
• Depression
• Anorexia (not eating)

Known for its white blooms and natural beauty, a peace lily isn’t quite so peaceful for dogs and cats. These plants are toxic. They contain insoluble calcium oxalate crystals, which can cause severe pain to the mouth, tongue, esophagus, and stomach.

“These irritating crystals are found in all parts of the plant,” Dr. Kendall says, and adds that symptoms appear immediately when chewed.

Symptoms include:

• Drooling
• Pawing at the face
• Vomiting
• Retching
• Redness and swelling of the lips, mouth, and tongue
• Diarrhea
• While extremely rare, if severe enough, swelling can affect the ability to breathe

Peonies are gorgeous summertime additions to outdoor landscaping, with their vibrant, fragrant blooms, but they are toxic to both dogs and cats.

Although ingestion of any part of the plant can cause symptoms, “it is more likely if the bark is ingested,” Dr. Kendall says.

“In most cases, just GI upset develops,” Dr. Schmid says. “If larger amounts are ingested, lethargy and depression may develop.”

Symptoms include:

• Vomiting
• Diarrhea
• Lethargy
• Depression

Popular in outdoor planters and hanging baskets, geraniums come in lots of colors—but no matter the hue, they are toxic to dogs and cats. Although all parts of the plant are toxic, Dr. Schmid points out that symptoms usually resolve on their own without needing medical treatment.

Symptoms include:

• Vomiting
• Diarrhea
• Depression
• Anorexia
• Skin irritation

Seen frequently during the fall months, you can’t miss colorful, pom pom-like mums seen in landscaping and in planters. “They are toxic to both dogs and cats, but are only expected to cause GI upset,” Dr. Schmid says.

Dr. Kendall further explains, “Mums contain pyrethrins, which can also be found in insecticides. However, pyrethrins in the plant do not pose any risks when the plant is eaten due to their low concentrations.”

Symptoms include:

• Vomiting
• Diarrhea
• Decreased appetite

Pothos plants, also known as Devil’s Ivy, are houseplants that are frequently spotted within trendy interiors, beloved for their bright green hue and trailing vines. But, you’ll want to keep them away from your pets.

“Pothos plants contain insoluble calcium oxalate crystals and can cause symptoms in both dogs and cats,” Dr. Kendall says. “These irritating crystals are found in all parts of the plant,” and symptoms result immediately when chewed.

Symptoms include:

• Drooling
• Retching
• Vomiting
• Diarrhea
• Poor appetite
• Redness and swelling of the lips, mouth, and tongue
• While extremely rare, if severe enough, this swelling could affect the ability to breathe

Found both indoors and out, the begonia is famed for its bright colors and interestingly shaped leaves. Dr. Schmid says that this plant is “toxic to both dogs and cats, but only expected to cause vomiting and diarrhea.” She adds that all parts of the plant are toxic.

Begonias can cause vomiting and diarrhea when dogs and cats ingest the stems, leaves, and flowers, Dr. Kendall says, due to insoluble calcium oxalate crystals in the plant.

Symptoms include:

• Vomiting
• Diarrhea
• Kidney damage (if the bulb is ingested)

In cheerful shades of yellow and dotting springtime landscapes, you can’t help but smile when you spot a sea of daffodils. But we doubt your dog or cat would be in a good mood if they ingest these plants.

Eating the foliage of a daffodil can result in vomiting and diarrhea, Dr. Schmid says, and in rare cases, seizures can result from eating the bulbs.

Symptoms of ingestion include:

• Vomiting
• Diarrhea
• Poor appetite
• Possible seizures and changes in blood pressure from ingesting bulbs

Easy to spot in a garden, gladiolas, which come in several different colors, are very tall and can bear upwards of 20 blooms on a single “spike,” as it’s called. Toxic to both dogs and cats, Dr. Schmid says that vomiting can be severe and contain blood. All parts of the plant are toxic, with the bulb being the most toxic.

Symptoms include:

• Severe vomiting that may contain blood
• Drooling
• Diarrhea
• Lethargy
• Painful abdomen