My dog ate methionine – what should I do?

Updated 2026-09-30 · 1 sources

Based on: Pet Poison Helpline

Call a vet now

Call your vet or the nearest emergency vet right now. An overdose can cause vomiting, abdominal pain, coma or blindness.

What to do right now

  1. Call your vet or the nearest emergency vet.
  2. Note what was eaten, how much and when.
  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 your dog any human medicine.

Why it can be dangerous

Methionine is an essential amino acid, or protein building block, that can be fed to animals to alter urine pH.[1] Grass saver tablets for dogs contain methionine to reduce the yellowing effect that dog urine has on grass.[1]

Signs to watch for

  • Vomiting
  • Abdominal pain
  • Coma
  • Blindness

Where it is found

  • Grass saver tablets for dogs
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.

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Common questions

What is methionine?

Methionine is an essential amino acid, or protein building block.[1]

Where might methionine be found?

Grass saver tablets for dogs contain methionine.[1]

What should I do now?

Call your vet or the nearest emergency vet right now.

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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