My Dog Ate A Highlighter What Should I Do?

Reviewed By Kim •  Updated: 03/15/24 •  4 min read
Dog Moderate Toxicity Level
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Oh no! Your dog ate a highlighter? Dogs can be frustrating when they eat things like that. It’s a fact that dogs are not discerning eaters. They will eat anything and everything that grabs their attention. They also love to chew, which may be why your fur baby decided to go after the highlighter.

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What are Highlighters Made Of?

The outer casing of a highlighter pen is nothing more than a plastic tube. On the inside of the plastic outer casing, the tube holds a sponge (or something similar), which allows the ink to flow across the paper. The ink is contained within the sponge.

The good news is that the sponge and ink are non-toxic for your dog. The sponge only contains a minimal amount of ink. The amount of ink and the chemicals it contained will not be enough to make your dog sick. That’s the good news!

Now, you’ll need to see how much of the highlighter’s outer casing may have eaten. Try to bring the pieces back to one place and put them together like a puzzle. Do you see anything pieces missing? Are they large? Or is most of the pen casing missing?

It is strongly recommended to contact a Pet Poison Helpline or your veterinarian.

If a large part of the casing is missing, it’s probably a good idea to call the vet. It’s possible your dog could have eaten the casing, which can cause an excruciating condition known as an intestinal blockage.

Some Highlighter Ink is Toxic to Dogs

Most highlighters are made with non-toxic ink; however, some are made with fluorescent dye. Fluorescent dye is used to give this ink a vivid color. The ink may include substances such as fluorescein, pyronines, and rhodamines.

In addition, highlighters may contain solvents that dissolve the dye to make it flow more smoothly. The solvents most commonly used can include alcohols or glycols. These are toxic to dogs.

Intestinal Blockage in Dogs

You may notice these symptoms if your dog has swallowed the highlighter’s outer casing:

These symptoms may not come on immediately; however, if you notice these symptoms in your dog, then go ahead and call the vet. This could be a life-threatening medical emergency.

What Should I Do If My Dog Ate a Highlighter?

The first thing you need to do is to stay calm. Staying calm allows you to better assess what’s happened, check how much of the highlighter was eaten and if it may have contained toxic ingredients, as well as check your dog’s condition.

Next, clean up any of the highlighter that may be left. If there are pieces of the outer casing, try to determine how much of it your dog may have eaten. Did he also eat the sponge and ink? Does it look like your fur baby chewed up the casing or could he have swallowed it whole? Note down the details to share with the vet.

Now, is your dog showing any symptoms, or is he acting normally? Note down any symptoms he may be having. It’s also a good idea to check your dog’s mouth for wounds or to see if any highlighter pieces may be caught in his teeth or throat.

Do not induce vomiting, as this can be dangerous. Only induce vomiting if your vet instructs you to do so.

Finally, call the vet and share these details with them. Follow your vet’s instructions closely to help your fur baby.

Treatment of Intestinal Blockage in Dogs

After you reach the vet’s, they will conduct a physical exam of your dog. They may also run some lab work to check your dog for any signs of infection or other health issues. If it has been about 1-2 hours since your dog ate the marker, the vet may try to induce vomiting. This can work to bring out the casing.

However, if the casing doesn’t come up, the vet may then run an x-ray to check your dog for a blockage. If the blockage is spotted, the vet may need to do surgery to remove the highlighter pen casing.

In most cases, dogs will go on to a full recovery as long as they receive prompt medical care.

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Kim

Kim is a talented author, who loves animals especially dogs. She engaged in writing books and articles relating to animals a decade ago. Kim resides in Chicago with her husband and son. The family is the proud owner of a dog and a parrot (Jack and Lily). Kim wanted more than these two pets, but her husband put his foot down... She often visits elementary schools to talk to the kids about what she learned about pets and how they could learn from them.

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