Permethrin toxicity in cats

By
✔ MRCVS
BSc
BVM&S
FHEA
Reviewed by Dr. Jennifer Macindoe
✔ MRCVS
BVMS
Updated February 27, 2026
4 min read

What is it?

Symptoms

Risk

Diagnosis

Treatment

How to help at home

Prevention

When to worry

Safe flea treatments for cats

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Permethrin toxicity in cats

By
✔ MRCVS
BSc
BVM&S
FHEA
Reviewed by Dr. Jennifer Macindoe
✔ MRCVS
BVMS
Updated February 27, 2026
4 min read

Permethrin toxicity in cats usually happens when a dog flea treatment is accidentally used on a cat, or when a cat comes into close contact with a recently-treated dog. It’s one of the most common feline poisonings worldwide, with hundreds of cases reported every year in the UK. Cats of any age and breed can be affected, and even a small amount can be life-threatening if it isn’t treated quickly. 

Permethrin toxicity is a medical emergency, but most cats recover well when toxicity is recognised and treated promptly. Seek help from a vet straight away if you think your cat is at risk.

What is permethrin toxicity in cats?


Symptoms of permethrin toxicity in cats


Cats at higher risk of permethrin toxicity


How do vets diagnose permethrin toxicity in cats?


What’s the vet treatment for permethrin toxicity in cats?

How to care for a cat with permethrin toxicity at home

Tips on how to prevent permethrin toxicity in cats


When to worry

Safe flea treatments for cats

You should always select the dose of flea and tick treatment based on your cat’s current weight, following the weight guidelines provided on the product packaging.

Safe vet-recommended flea treatments for cats that do not contain pyrethrins include:

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Seresto Flea and Tick Control Collar for Cats
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