Pyrethrum vs. Permethrin: Know Which Insecticides Are Safe

Posted on 9 July 2025
By Dr. Jill Tack
Posted in cats, dogs, natural ways to prevent fleas in cats and dogs
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Pyrethrum is a genus class of plants in the Chrysanthemum family, which includes the herbal plant feverfew. Pyrethrum also refers to the natural insecticide that comes from this plant species. When looking for flea treatments for your pet, don't be fooled by pyrethrum's man-made chemical replacement, permethrin. Permethrin is the synthetic version of pyrethrum that is chemically man-made to use as an insect repellent, most commonly for fleas found on dogs.

Permethrin is a synthetic insecticide commonly used in flea treatments, bug sprays, and pest control products. While it works by targeting insects' nervous systems, it's not safe for your dog—and especially dangerous for cats.

You’ll often find it in:

Flea and tick spot-on treatments
Insecticide sprays
Mosquito foggers
Treated clothing and gear

Even products labeled “natural” or “organic” may still contain permethrin. Always double-check ingredients, or stop by The Pet Beastro in Madison Heights and we’ll help you choose safer options.

Signs of Permethrin Poisoning in Pets

Permethrin can cause a range of symptoms depending on the exposure level.

In dogs and cats, watch for:

Skin irritation
Drooling
Shaking or twitching
Vomiting or nausea
Difficulty walking
Seizures (in severe cases)

Cats are especially vulnerable, as their livers cannot process permethrin effectively, even licking a dog treated with permethrin could be dangerous.

Environmental Damage You Might Not Realize

Permethrin doesn't just stay on your pet, it leaches into the environment.

Harms aquatic life and pollinators
Contaminates soil and water systems
Lingers in your home, lawn, and neighborhood

For eco-conscious pet parents, skipping permethrin is one of the best decisions you can make.

Pyrethrum: A Safer Alternative

Derived from chrysanthemum flowers, pyrethrum is a natural insecticide that breaks down more quickly in the environment and poses less harm to pets and wildlife (when used correctly).

Bonus tip: You can grow pyrethrum at home and make an infusion to spray lightly on your dog’s coat as a natural repellent. Ask our team for DIY tips!

Use caution with cats, but overall, pyrethrum is a better choice than synthetic chemicals.

Boosting Your Pet’s Immune System to Keep Fleas Away

Fleas are opportunists. They’re drawn to inflamed, imbalanced pets. A well-nourished body is naturally more resistant to parasites.

Our favorite holistic flea deterrents:

Echinacea: Supports immunity
Earth Animal Internal Flea & Tick Powder: Daily herbal defense from the inside out
Nature’s Sunshine Garlic Capsules: A natural insect-repelling powerhouse (for dogs only)
Goat Milk & Raw Toppers: Support digestion, skin health, and natural detox pathways

Attention, Michigan Pet Parents!

Did you know many Metro Detroit communities, including Madison Heights, Troy, Royal Oak, and Ferndale, use mosquito foggers that may contain synthetic pyrethroids or permethrin?

Protect your pet:

Keep them indoors during fogging days
Cover water and food bowls outside
Use a paw-washing station after walks
Choose yard-safe sprays from The Pet Beastro that are pet-friendly and planet-approved

Safer, Trusted Flea Solutions We Recommend

Our team has handpicked products that get the job done without harming your furry friend.

Remember, our pets can't communicate their discomfort the way we can. Using chemicals like permethrin can have serious consequences for their health and could even be life-threatening. Embrace natural alternatives to promote better health and longevity for your beloved companions.

Stop by our retail locations in Madison Heights, Michigan, just north of Detroit, or in Warren, Southeast Corner of East 14 Mile Road and Schoenherr, which are open Monday through Saturday, 10:00 am - 8:00 pm, and Sundays from 10:00 am - 6:00 pm. Also, visit our 24/7 natural pet food treats, toys, and supplies store online. Please message us on Instagram, Facebook, or TikTok for further information!