The Danger of Mexican Marigold Flowers for Dogs

Also known as "Mexican Marigolds," these are very common flowers in countries like Spain, Mexico, Peru, and Argentina, though each country usually calls them by a different name. This is a plant species highly dangerous to dogs due to its toxicity.

It's usually sold at flower shops, though it can also grow naturally in any garden, or be planted by city councils to decorate public spaces. Either way, this is a plant that's usually within our pets' reach, and we need to be especially careful with it, since besides being eye-catching, it's very poisonous.

Why Is the Cempasúchil Plant Toxic to Dogs?

Although this is a very showy, eye-catching plant widely used in flower arrangements and park and garden decoration... Cempasúchil contains a toxic substance called thiophene in its sap.

Thiophene is found throughout the plant, meaning the flower, leaves, stem, and root are all toxic. It's a colorless substance with a pleasant smell, which can fool us if we're unaware of its harmful properties.

Although the amounts of this substance in Cempasúchil plants are low and not very poisonous to humans, dogs show a different set of symptoms in response to this toxin. Ingesting it can be fatal for our pet, even leading to death.

Cempasúchil Flowers

What Symptoms Does a Dog Poisoned by Cempasúchil Show?

The main symptom this plant causes is irritation, so if our dog, whether out of curiosity, mischief, or by accident, eats a Mexican Marigold... it'll suffer irritation of the lips, mouth, throat, esophagus, and digestive organs.

Skin irritation similar to other conditions may also appear, in localized areas or spread out. Along with inflammation, mainly around the mouth. At first, we might think our dog was stung by an insect like a wasp or bee, which is why it's so important to know this plant and understand the problem it causes in dogs.

What Should I Do If My Dog Eats or Licks a Mexican Marigold?

You need to see a vet and explain what happened. If you're unsure about the plant, it's best to grab a sample and bring it to the vet too, so they can evaluate it and confirm whether it's a toxic plant.

Usually, a few days of corticosteroid treatment is enough to ease the symptoms, though in extreme cases, the dog may need to be hospitalized for a few days.

What you should never do is downplay the problem — even if your dog doesn't show symptoms right away, it may develop them after a few minutes or even hours. If you don't see a vet, you could be putting your pet's life at risk.

Interestingly, this flower is also known as the "flower of the dead"... and not because of how deadly it is to pets, but because of the Mexican tradition of using this plant.