My dog ate Pimobendan – what should I do?

Updated 2026-09-30 · 1 sources

Based on: Pet Poison Helpline

Call a vet today

Call your vet today for advice – don't wait until signs appear. Pimobendan is toxic to dogs and may cause lethargy, weakness, collapse, an elevated heart rate, or low blood pressure.

What to do right now

  1. Call your vet or the nearest emergency vet.
  2. Note what, how much and when your dog ate.
  3. Bring the packaging.
  4. Keep your dog calm.
  5. Remove what is left.

Don't

  • Do not make your dog vomit unless a vet tells you to.
  • Do not give any human medicine.

Why it can be dangerous

Pimobendan is a common veterinary heart medicine.[1] It works by increasing the contraction of the heart while providing some vasodilatory properties.[1] Its vasodilatory properties allow blood vessels to dilate.[1]

Signs to watch for

  • Lethargy
  • Weakness
  • Collapse
  • Elevated heart rate
  • Low blood pressure

Where it is found

  • Chewable tablets
If your pet is struggling to breathe, has collapsed, is having a seizure or can't stand up: go to the nearest vet now.

Not sure how serious it is?

OkPaw asks a few quick questions about your pet and tells you in 30 seconds whether it can wait. Free on Google Play for Android.

Get it on Google Play

OkPaw is on Android now – an iPhone version is on its way.

Common questions

How much Pimobendan is dangerous?

Tell your vet what and how much your dog ate.

What signs should I watch for?

Lethargy, weakness, collapse, elevated heart rate, or low blood pressure.

What should I do now?

Call your vet or the nearest emergency vet, note what, how much and when your dog ate, and bring the packaging.

Sources

  1. Pet Poison Helpline

How this page was made: written with the help of AI from the sources below, then checked claim by claim against those sources. Urgency levels follow OkPaw’s fixed safety rules. It is guidance, not a diagnosis. How we write our pages

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