Understanding Lily Toxicity in Dogs

As both a veterinarian and a lifelong dog owner, I’ve had tulips in my garden for years. But when it comes to lilies, many of us have heard horror stories about cats. The good news for dog owners is that true lilies (Lilium species) and daylilies (Hemerocallis) are not nearly as dangerous to dogs as they are to cats. In cats, even a small nibble can cause fatal kidney failure. In dogs, the toxicity is much lower. However, that doesn’t mean lilies are completely safe. Some lilies can still cause gastrointestinal upset, and other plants commonly called “lilies” (like peace lilies or lily of the valley) pose real risks.

Let me break down the types of lilies and what happens if your dog eats them. As a rule of thumb, always assume any plant part (petals, leaves, stems, pollen, or even water from the vase) could cause a problem. If your dog ingests any part of a lily, monitor them closely and contact your vet or a pet poison helpline.

Which Lilies Are Dangerous for Dogs?

It’s important to distinguish between true lilies and other plants that share the name. Here are the main categories:

True lilies (Lilium spp.) and daylilies (Hemerocallis spp.): These include Easter lily, tiger lily, Asiatic lily, and Stargazer lily. In dogs, ingestion typically causes mild to moderate gastrointestinal upset like vomiting, diarrhea, and drooling. Rarely, large amounts might cause more serious issues, but life-threatening kidney damage as seen in cats is extremely uncommon in dogs. Still, any vomiting or diarrhea can lead to dehydration, especially in small breeds or puppies.

Lily of the valley (Convallaria majalis): This is a different plant entirely. It contains cardiac glycosides that can cause serious heart rhythm abnormalities, low blood pressure, and even seizures. This is a genuine emergency. If your dog eats lily of the valley, seek immediate veterinary care.

Peace lily (Spathiphyllum spp.) and calla lily (Zantedeschia aethiopica): These are not true lilies but contain insoluble calcium oxalate crystals. When chewed, these crystals cause intense oral irritation, excessive drooling, pawing at the mouth, and swelling of the tongue and throat. While rarely life-threatening, it can be very painful and require veterinary intervention to manage pain and ensure the airway is clear.

As a rule, if you’re unsure which lily your dog ate, assume the worst and call your vet. If you have lilies in your home or garden, consider removing them entirely if your dog is a chewer.

Symptoms to Watch For

Symptoms vary depending on the type of lily and amount ingested. Here’s what to look for:

  • True lilies/daylilies: Vomiting, diarrhea, drooling, loss of appetite, lethargy. These usually appear within a few hours and may last 24-48 hours.
  • Lily of the valley: Vomiting, diarrhea, slow or irregular heart rate, weakness, collapse, seizures. Symptoms can be delayed but may become severe quickly.
  • Peace lily/calla lily: Immediate pawing at the mouth, drooling, vocalizing, swelling of lips or tongue, difficulty swallowing.

If your dog shows any of these signs after being near lilies, contact your veterinarian immediately. Time is critical for lily of the valley poisoning. For true lilies, your vet may recommend inducing vomiting if ingestion was recent, or providing supportive care.

What to Do If Your Dog Eats a Lily

First, stay calm. Identify the plant if possible – take a photo or save a sample. If it’s lily of the valley, go to the nearest emergency vet immediately. For other lilies, call your vet or a pet poison hotline (like ASPCA Animal Poison Control at 888-426-4435). Do not induce vomiting unless specifically instructed by a professional, as some plants can cause more damage when vomited.

Your vet may advise you to give a small amount of milk or yogurt to bind calcium oxalate crystals (for peace lilies), but only if directed. In many cases, if your dog ate a small amount of a true lily and is showing no symptoms, your vet may recommend monitoring at home. But always err on the side of caution.

As a responsible owner, the best approach is prevention. Keep lilies out of reach, especially during holidays like Easter when they are common. Consider pet-safe alternatives like sunflowers, roses, or orchids. Your dog’s safety is worth more than a bouquet.

Key Takeaway

While true lilies pose only mild risk to dogs, lily of the valley is life-threatening; always identify the plant and call your vet if your dog ingests any part of a lily.

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What you need to know

Lilies are far more dangerous to cats than to dogs, but they are still not a plant you want your dog nibbling. True lilies cause mainly stomach upset in dogs, with vomiting, drooling and loss of appetite if leaves or petals are eaten. The bigger worry is plants sold under the lily name that are not true lilies, such as lily of the valley, which can affect the heart, or peace lily, which irritates the mouth and throat.

Keep cut arrangements and potted lilies on high shelves or out of the room your dog uses. Sweep up fallen petals and pollen, since curious dogs often hoover the floor. If your dog eats any part of a lily, note the exact plant if you can, remove the rest and ring your vet. Lily of the valley in particular needs prompt attention rather than waiting to see how things go.