Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

My Cat Ate Dog Dewormer! Here’s What to Do (Vet Answer)

Share

Thankfully, dog dewormers are not inherently toxic to cats. However, the potential issue is whether a cat has eaten too much of the dewormer since dogs can be much larger than cats. Here’s everything you need to know to determine if your cat is in danger after eating dog dewormer.

divider cat paws 2 oct 2024

What to Do if a Cat Eats Dog Dewormer

Try to assess the situation. Can you tell exactly which dewormer your cat ate and how much they ate? Can you note when it was eaten? Write this information down and collect any deworming packaging if you have it. Be sure to remove all dewormers from the area so your cat can’t get into it anymore.

Now you want to contact the Pet Poison Helpline. For a fee, this 24-hour, 365 days a year service has specialists ready to check the risk to your cat from ingesting whichever dewormer they ingested. They will let you know if your cat needs to see a veterinarian immediately, soon, or only if signs of illness develop.

Signs of Illness in a Cat From Eating Dog Dewormer

If your pet is showing these signs, we suggest you speak to a vet.

[/sc]–

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money

Supportive Care for a Cat That Eats Dog Dewormer

If the Pet Poison Helpline advises that your cat ate more dewormer than a normal dose for cats but doesn’t need to see a veterinarian, they will advise you to watch them at home for signs of illness like those above. Over the next day or so, you’ll want to check in with your cat frequently, including their litter box, watching for any changes. Encourage eating as usual and increased drinking, if possible, to support hydration.

For cats that experience any diarrhea, which would be the most likely sign you’ll see, you can provide a bland diet instead of their normal cat food to help them recover. A bland diet is made of boiled boneless, skinless, non-seasoned chicken breast—shredded, mixed half and half with cooked white rice. Feed the same volume of food you normally would but made from the chicken and rice mixture. You can also mix one teaspoon of 100% pumpkin puree into each meal as a source of fiber.

Cat drinking from ceramic bowl
Image By: Pattysan, Shutterstock

divider cat paws 2 oct 2024

Frequently Asked Questions

Can eating dog dewormer kill my cat?

This would be incredibly rare. Dog dewormers are well tolerated in cats, and a cat would have to eat a very significant amount of dewormer for this to happen, but it is possible.

Do dog dewormers taste good to cats?

In most cases, no, but pyrantel can come flavored, and some cats, especially kittens, may like licking this. In small amounts, that’s not a problem, but if they happen to knock over a whole bottle and ingest a significant amount of it, they may become ill.

divider cat paws 2 oct 2024

Conclusion

Most dog dewormers are safe for cats at appropriate doses. If they do happen to eat too much, it can make them sick, and in the worst cases, that can be fatal. The Pet Poison Helpline should be contacted immediately if your cat is suspected of having ingested dog dewormer so they can best advise the next steps. While the most common side effects of dewormer ingestion in cats would be vomiting, diarrhea, and hypersalivation, more serious side effects can occur.

See Also: 


Featured Image Credit: gabriel claudiu puscau, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Catster's Digital Magazine is Back!

Vet-approved health & behavior advice

Real cat stories & community features

Chatting About the Rainbow Bridge, Euthanasia, and Laughter During Grief | Chatty Cattys, Episode 24

If you’ve ever felt the loss of a beloved cat, or are dreading the day when your pet crosses the rainbow bridge, you’ll...

The Simple Reasons Cats Refuse to Let Anyone Use the Bathroom Alone

Cats have an extraordinary talent for making themselves present in the most inconvenient places, and the bathroom ranks near the top of the...

A Paw-sitive Milestone: Canada Officially Becomes a Declaw-Free Nation

Canada has officially become a declaw-free nation. On May 25, 2026, a new regulation was filed in Ontario under the Provincial Animal Welfare...

The Surprisingly Simple Ways to Help a Cat With Hairballs

Cats spend an astonishing amount of time grooming. It is part hygiene routine, part comfort ritual, and part instinct that traces back generations....

More related

Maine Coon Hip Dysplasia: Why Is It So Common? Our Vet Answers

Your Maine Coon is a loveable giant of a cat, but you’ve noticed that they seem to favor a hind leg when they’re...

Cats and Video Chats: Why Doesn’t Clutch React to the Computer?

Hi, I’m Dr. Karyn! Read my introduction to learn more about me and meet my five hilarious cats: Clutch, Cyril, Alex, Zelda, and...

Can Cats Detect Mold? Facts & Health Risks Explained (Vet-Reviewed)

There is no clear-cut answer to the question “Can cats detect mold?” but there are ways your cat may be alerting you to...

The 5 Things Cats Are Communicating With a Paw to the Face

Cats have a reputation for being aloof, which makes it all the more puzzling when they reach out and deliberately place a paw...

Keep reading

10 Best Cat Foods for Your Sphynx Cat in 2026 – Reviews & Top Picks

The majestic Sphynx—ancient, unique, and always arriving to the party in their birthday suit. You have one of the most sought-after and alluring cat breeds on the planet, and you want to feed them right! Nutrition is key to a...

sphynx cat eating dry kibble from metal bowl

Can Cats Eat Spaghetti? Vet Reviewed Facts To Know!

It’s totally normal for loving pet owners to want to share their favorite foods with their feline companions. In many cases, this is a relatively harmless practice, though sometimes, it can be quite detrimental to your cat’s health. Spaghetti isn’t...

Can Cats Eat Spaghetti

Is Alstroemeria Toxic to Cats? Vet-Approved Advice

If your cat just ate some of your Peruvian Lily or rubbed on the petals you may be panicking. Although the ASPCA lists Peruvian Lily, also known as Alstroemeria, as safe for cats, dogs, and even horses, it is listed...

Catster_Is Alstroemeria Toxic to Cats

Giardia in Cats: Causes, Signs & Care (Vet-Approved Facts & FAQ)

One of the most distressing experiences as a cat parent is suspecting or learning that your cat is unwell in some way. To add to your woes, medical terminology can sometimes be hard to process, especially when you’re under duress....

Sick cat, IV, dehydration, dropper

Can I Crate My Cat During the Day? Vet-Approved Tips & FAQ

If your cat gets into trouble when left home alone, you might be desperate for a solution, especially if they’re prone to destructive behaviors. Maybe you’ve even wondered if you can crate your cat during the day like a dog....

Grey cat fell asleep in crate

Why Is My Cat Suddenly Sleeping in Odd Places: 7 Vet-Verified Reasons

Did you know cats can sleep between 12 and 18 hours daily? It’s true, and studies suggest that almost 40% of cats will sleep more than 18 hours in a single day!1 Since your kitty spends so much time sleeping,...

grey tabby cat sleeping on warm radiator

When Should Cats Stop Eating & Drinking Before Spaying or Neutering? Vet Approved Advice

Before most surgeries, it is generally recommended that you stop feeding and giving water to your feline. When under anesthesia, there is always a chance that the cat may vomit while asleep and then aspirate. However, the chance is lower...

orange cat eating wet food

Can Cats Get Kidney Transplants? Our Vet Discusses Facts & Considerations

Kidney disease is one of the most common causes of illness and death in cats, with almost 80% of cats over 15 years experiencing some form of renal insufficiency. Although it is usually associated with older felines, younger cats—through congenital...

two different cats standing side by side outdoors in the garden

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.