Household Plants and Foods That Are Toxic to Pets

Why Everyday Items Can Be Dangerous

Many pet owners are surprised to learn that some of the most familiar items in their homes — fresh-cut flowers, kitchen staples, and pantry ingredients — can cause serious illness or even death in dogs and cats. The mechanisms vary: some toxins disrupt red blood cells, others cause kidney failure, and still others affect the nervous system. The risk often depends on the species, size of the animal, and the quantity ingested.

This guide is intended as a quick reference, not a substitute for veterinary care. If you suspect your pet has ingested a toxic substance, contact your veterinarian or the ASPCA Animal Poison Control Center immediately. Being informed before an incident happens is one of the most effective steps a pet owner can take — especially when preparing your home before a new pet arrives.

Toxic Foods: A Species-by-Species Breakdown

Not all foods harmful to dogs are equally harmful to cats, and vice versa. The list below covers the most commonly encountered culprits in US households.

Toxic to Both Dogs and Cats

• Grapes and raisins: Even small amounts have been linked to acute kidney failure. The exact toxic compound is still not fully identified, making any exposure a medical concern.
• Xylitol (birch sugar): Found in sugar-free gum, peanut butter, and baked goods. In dogs, it triggers a rapid drop in blood sugar and can cause liver failure. Cats appear less frequently exposed but are not immune.
• Alcohol: Even small quantities cause vomiting, disorientation, breathing difficulties, and can be fatal.
• Macadamia nuts: Associated with weakness, hyperthermia, and vomiting in dogs. Less studied in cats but should be avoided.

Toxic Primarily to Dogs

• Onions, garlic, leeks, and chives: All members of the Allium family damage red blood cells, leading to hemolytic anemia. Garlic is significantly more potent by weight than onion. Cooked forms remain toxic.
• Chocolate: Contains theobromine and caffeine. Dark chocolate and baking chocolate carry the highest risk. Symptoms include vomiting, tremors, and cardiac arrhythmias.

Toxic Primarily to Cats

• Raw onions and garlic: Cats are more sensitive to Allium toxicity than dogs, with even small amounts posing risk.
• Tuna (in large quantities): While not acutely toxic, an all-tuna diet can cause mercury poisoning and a thiamine deficiency over time.

For deeper context on how food choices affect long-term health, see our guide to feeding habits that quietly harm pet health.

Toxic Household Plants

Common ornamental plants — many found in homes, gardens, and grocery store flower bouquets — carry meaningful toxicity risks. Severity ranges from mild gastrointestinal upset to organ failure.

High-Severity Plants

• Lilies (true lilies, including Easter lily, tiger lily, and daylily): Cats are extremely sensitive. Even small amounts — including pollen or water from the vase — can cause acute kidney failure. Dogs experience milder gastrointestinal effects. This is considered one of the most urgent plant toxicities in feline medicine.
• Sago palm: All parts are toxic, with seeds carrying the highest concentration of cycasin, a compound that causes liver failure. Fatality rates are high even with treatment.
• Oleander: Contains cardiac glycosides that affect heart rhythm. Toxic to both species in small quantities.

Moderate-Severity Plants

• Azalea and rhododendron: Contain grayanotoxins that can cause vomiting, drooling, low blood pressure, and cardiac effects.
• Dieffenbachia (dumb cane): Causes intense oral irritation, swelling, and difficulty swallowing from insoluble calcium oxalates.
• Pothos and philodendron: Similar calcium oxalate crystals; generally cause oral pain and gastrointestinal distress rather than systemic toxicity.

Lower-Severity but Still Concerning

• Aloe vera: The gel interior is considered safe but the latex layer contains saponins and anthraquinones that cause vomiting and diarrhea.
• Peace lily (Spathiphyllum): Despite its name, not a true lily. Causes oral irritation and GI upset rather than kidney failure, but should still be kept out of reach.

If you cook for your pet at home, it's worth cross-referencing plant and ingredient exposure — our article on home-cooked pet meals outlines ingredients to avoid alongside nutritional guidance.