Virbac Knockout Area Treatment Spray, 14-fl oz can

Skip image gallery
Slide 1 of 7
$15.46 First Time Autoship Price
this order
Save 35% (up to $20) today when you set up Autoship. 
$22.60 Autoship Price
(-5%) future orders
  • Keep saving 5% on every order
  • Get deliveries on your schedule
  • Skip, change, or cancel anytime
$23.79 Chewy Price
($1.70 /fl oz)
Save $1.60 (-6%)
$25.39 List Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card + Free Shipping with code: WELCOME
In Stock
FREE 1-3 day delivery on first-time orders over $35
Free 365-day returns

No interest if paid in full in 6 months on PayPal purchases of $149+. .

About This Item

Details

  • Aerosol home treatment spray containing synthetic pyrethroids that quickly kills adult and larval fleas and ticks.
  • Prevents subsequent flea infestations for up to 4 months.
  • Contains pyriproxyfen, an Insect Growth Regulator that inhibits flea growth and kills fleas before they reach the adult biting stage.
  • Area treatment that covers 2,000 square feet.
  • Veterinarian recommended. Safe, effective, and powerful treatment of flea and tick infestation.

Ingredients

Instructions

FAQ

Learn More About Virbac From Our Team of Experts
Important Information

Fleas rise to the top of your pet's coat as they die, so consider it a triumph if you start seeing more fleas at first, after treating your pet. If you’re still seeing fleas after application, it may be because your pet has picked up new fleas from the environment, which may include other pets, surfaces and outdoor areas. It may take up to 30 days to break the entire flea life cycle. Additionally, you should also treat sources of new fleas (i.e., carpet, yard, etc.) to ensure complete flea control.

About Virbac Dog Pest Protection

Pest Protection

External parasites can be a nuisance to your dog. Use Virbac's topical product for convenient, quick-acting, long-lasting, effective control of fleas and ticks. Kills adult fleas for up to one month and prevents flea eggs from hatching or developing into larvae or adult stages for up to 3 months. Do not use on dogs less than 8 weeks of age. Do not use on cats.

Team Up Against Parasites

Every dog, everywhere deserves affordable year-round parasite protection. IVERHART MAX® (ivermectin/pyrantel pamoate/praziquantel) Soft Chew offers broad coverage with protection against heartworms, roundworms, hookworms and tapeworms. A proven formula with active ingredients recommend by veterinarians for years, IVERHART MAX Soft Chew is bacon-flavored; a soft chew that your dog will love. Important Safety Information for IVERHART MAX ® (ivermectin/pyrantel pamoate/praziquantel) Soft Chew: All dogs should be tested for existing heartworm infection before starting treatment with IVERHART MAX Soft Chew. Use with caution in sick, debilitated, or underweight dogs weighing less than 10 lbs. Gastrointestinal and neurological signs, such as convulsions, have been reported following the use of ivermectin products. For complete product information, refer to the product insert.

Protect Your Home

Not only are there solutions to help control parasites on your dog, but Virbac also has a solution for your home. KNOCKOUT® Area Treatment kills adult fleas and ticks and controls pre-adult fleas (Larvae) for 120 days. For indoor use only. For use in homes and residential use sites. Not for use in commercial or industrial buildings.

About Virbac

Founded in 1968 by a French veterinarian, Virbac is an independent pharmaceutical laboratory dedicated to animal health. For fifty years, the company has built a personalized relationship with veterinarians. Through this partnership, Virbac contributes, day after day, to shape the future of animal health.

Shop Virbac

Frequently bought together

Questions & Answers

18 Customer Questions

Can I use this on mattresses that people sleep on including children?

Answer by Chewy • Jun 13, 2023
This spray should only be used on rugs, carpets, upholstered furniture, pet beds, and pet resting areas. The spray is not safe to spray on areas with prolonged human contact. Always test the treatment spray first in a spot that cannot be seen to know if it will stain.

Would this work for bed bugs?

Answer by Chewy • Jun 07, 2018
This spray is great for clearing fleas, ticks, bed bugs, ants and other unwanted insects.

Do i need to vacumn after the spray drys

Answer by Chewy • Jul 08, 2018
Once the product has dried, vacuuming is recommended.

whats the difference between Knockout and Knockout E.S.

Answer by Chewy • Nov 11, 2019
The Knockout ES Area Treatment Spray can be used in residential, industrial, and commercial buildings as well as automobiles and will prevent flea infestations from developing for up to 7 months. The Knockout spray is only for residential use which kills and prevents flea and tick infestations for 4 months.
Reviews
Write a Review
4.3
Rated 4.3 out of 5 stars
237 Ratings
Terms & Conditions

Customers Mention

Chewy identifies key considerations with the help of artificial intelligence and our veterinarians.

Duration of Protection

83% Positive

Ease of Application

76% Positive

Effectiveness

82% Positive

Safety

84% Positive

159 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.

Rated 3 out of 5 stars
By BC on Jan 16, 2026

Overpowering smell

The pesticide smell was so strong even on just a small cat bed that I couldn't use it in the house. There's just no way. Even that little bit was overpwering.

The pesticide smell was so strong even on just a small cat bed that I couldn't use it in the house. There's just no way. Even that little bit was overpwering.

Rated 5 out of 5 stars
By Vickie on Nov 26, 2025

Best product on market

I've been using this home spray for many years. Our apartment complexe grassy areas are flea laden, as such not uncommon for me to see fleas on Blaze after walking

I've been using this home spray for many years. Our apartment complexe grassy areas are flea laden, as such not uncommon for me to see fleas on Blaze after walking him. He's on a monthly topical but to protect the interior of living quarters I use Knockout. It has kept our apartment flea free for years.

Rated 5 out of 5 stars
By Shelly on Dec 16, 2025

Love this spray!

I first found this product from a vet years ago and I swear by it! It works so great! It fixes the flea problem quickly and lasts for awhile too. I won't use any

I first found this product from a vet years ago and I swear by it! It works so great! It fixes the flea problem quickly and lasts for awhile too. I won't use any other product to get rid of the fleas in or around my house.

Rated 5 out of 5 stars
By Kitty on Aug 25, 2025

It works

And is it my small apartment, I have three cats and one small dog and it worked very well. The only thing is it is pretty toxic smelling even after you’ve aired

And is it my small apartment, I have three cats and one small dog and it worked very well. The only thing is it is pretty toxic smelling even after you’ve aired out and vacuumed with a rainbow vacuum, which cleans the air that is my one, yuck about it, but it worked very well I bought two cans even though my apartment is less than 600 ft. but with three animals and one that goes outside many times a day and being in Florida I figured it was recommended to me by dog breeder actually, I did not use all of the first can and I did my beds, my couch, the dog bedding, the cat stand, where they lay down the everything so I have plenty more. Should this problem rear up again?

Rated 5 out of 5 stars
By Nancy on Oct 19, 2025

Knockout

I've had to use this in my mom's house one time. It worked great. I just got a new kitten that had fleas. I used this and it got rid of them in no time at all. This

I've had to use this in my mom's house one time. It worked great. I just got a new kitten that had fleas. I used this and it got rid of them in no time at all. This is a great product.

Rated 5 out of 5 stars
By Nancy on Oct 16, 2025

Ease of use

The spray dried quickly so the living area was inhabitable within a couple of hours. I waited to all mist in the air to dissipate according to the directions on

The spray dried quickly so the living area was inhabitable within a couple of hours. I waited to all mist in the air to dissipate according to the directions on the can.

Rated 5 out of 5 stars
By Joyce on Oct 10, 2025

Good for getting rid of the creepy crawlers or hoppers

This works great and I will keep using it. With 9 cats indoors we still get some fleas. I spray this on carpets and furniture. It sure helps. It smells rather pleasant

This works great and I will keep using it. With 9 cats indoors we still get some fleas. I spray this on carpets and furniture. It sure helps. It smells rather pleasant too.

Rated 1 out of 5 stars
By Kim on Aug 19, 2025

Wrong adress

I ordered this product for the first time last week. Decided I needed to add another one. Chewy emailed to make sure I needed the secong duplicate order and for

I ordered this product for the first time last week. Decided I needed to add another one. Chewy emailed to make sure I needed the secong duplicate order and for some reason it was sent to another adress in my list. Instead of the same adress the first one was sent to. How can this be resolved

Rated 5 out of 5 stars
By Jennifer on Jan 3, 2026

This worked really well

Only product I’ve ever found that took care of fleas in carpets

Only product I’ve ever found that took care of fleas in carpets

Rated 5 out of 5 stars
By Constance on Jan 2, 2026

Flea killer

Delivered intact and as described very happy with purchase

Delivered intact and as described very happy with purchase