What should I do if my dog ate Watercress?

Remove any remaining plant material from your dog's mouth and offer fresh water. Do not induce vomiting at home unless a veterinarian or poison-control specialist tells you to — Pet Poison Helpline notes that inducing vomiting without professional guidance can do more harm than good. Then call your vet or ASPCA Animal Poison Control (888-426-4435). Call your vet or ASPCA Animal Poison Control (888-426-4435) if vomiting or diarrhea is severe, bloody, lasts more than a few episodes, or if your dog seems weak or dehydrated. A small mouthful that produces a single bout of vomiting and otherwise normal behavior is rarely an emergency, but a phone consult is still the safest call.

Watercress — (c) Andrew Tree, some rights reserved (CC BY), uploaded by Andrew Tree — Photo by (c) Andrew Tree, some rights reserved (CC BY), uploaded by Andrew TreeiNaturalistCC BY

Photo by (c) Andrew Tree, some rights reserved (CC BY), uploaded by Andrew TreeiNaturalistCC BY

dog safety reference

Is Watercress safe for dogs?

Q: Is Watercress safe for dogs?

Watercress is potentially toxic to dogs. Ingestion can lead to digestive irritation. Always consult a veterinarian if your dog exhibits signs of distress after eating this plant.

Nasturtium officinale

Nasturtium officinale is an aquatic or semi-aquatic perennial plant often grown for culinary use, but it can cause gastrointestinal distress if ingested by pets. It is distinct from the common garden Nasturtium (Tropaeolum majus).

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NasturtiumNasturtium officinaleWatercress

Light: Bright indirect light
Habit: Trailing or creeping
Care: High (requires constant moisture)

Safety status

Dogs

Potentially toxic

Consulted references classify the plant as toxic or irritating for that pet type.

Verified against ASPCA/provenance audit 2026-05-06 on May 6, 2026.

Sources

ASPCA Toxic Plant List

What this means for your dog

Dogs that nibble watercress usually get away with a queasy stomach rather than a true emergency. ASPCA lists the plant as toxic to dogs, but the toxic principles are gastrointestinal irritants and signs are typically mild — not the kind of cardiac or neurological reaction you see with truly dangerous plants.

What to watch for

Mild vomiting and diarrhea are the signs ASPCA documents. Watch also for reduced appetite or lethargy in the hours after ingestion. Symptoms usually stay confined to the digestive tract.

Time window

Onset and duration are not well documented for watercress specifically; gastrointestinal irritants generally produce signs within a few hours and resolve in 24–48 hours with supportive care.

When to call the vet

Call your vet or ASPCA Animal Poison Control (888-426-4435) if vomiting or diarrhea is severe, bloody, lasts more than a few episodes, or if your dog seems weak or dehydrated. A small mouthful that produces a single bout of vomiting and otherwise normal behavior is rarely an emergency, but a phone consult is still the safest call.

First aid at home

Remove any remaining plant material from your dog's mouth and offer fresh water. Do not induce vomiting at home unless a veterinarian or poison-control specialist tells you to — Pet Poison Helpline notes that inducing vomiting without professional guidance can do more harm than good. Then call your vet or ASPCA Animal Poison Control (888-426-4435).

Sources: ASPCA, Pet Poison Helpline.

If a pet has chewed or swallowed plant material and is showing symptoms, contact a veterinarian or poison resource immediately. This product is for structured reference, not diagnosis.

Dogs — concern notes

Common signs

Vomiting, diarrhea, and abdominal discomfort.

Escalation note

Ingestion can lead to digestive irritation. Always consult a veterinarian if your dog exhibits signs of distress after eating this plant.

Safer alternatives

No hand-picked alternatives for this plant yet. You can still pick your own using the Compare button on any other plant.

Source evidence

ASPCA Toxic Plant List

toxicology · 99% reliability

Open source

Watercress is listed as toxic to both cats and dogs by the ASPCA.

Cats & dogs page cats page My dog ate Watercress

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