Ultra Boss Pour-On Insecticide Fly & Insect Control for Cattle, Sheep, Goats & Horses, 1-quart bottle

Skip image gallery
Slide 1 of 4

$26.90 First Time Autoship Price
this order
Save 35% (up to $20) today when you set up Autoship. 
$41.39 Autoship Price
future orders
  • Get deliveries on your schedule
  • Skip, change, or cancel anytime
$41.39 Chewy Price
Save $0.93 (-2%)
$42.32 List Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card + Free Shipping with code: WELCOME
In Stock
FREE 1-3 day delivery
Free 365-day returns

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

About This Item

Details

  • Low-volume dosage reduces time and labor.
  • Effective horn fly control. Also controls face flies.
  • Season-long lice control with one application (January through April).
  • Apply 3 mL per 100 lbs body weight, up to 30 mL maximum application limit.
  • Also approved for use in back rubbers.

Ingredient Information

Instructions

Frequently bought together

Questions & Answers

3 Customer Questions

Does the Ultra boss control ticks on horses?

Answer by Chewy • May 17, 2025
This insecticide targets lice, horn flies, face flies, horse flies, stable flies, mosquitoes, black flies and ticks.

Is this safe to use on dairy cattle in lactation? Is the milk safe?

Answer by Chewy • Jul 19, 2025
This can be applied to lactating and non-lactating dairy cattle. It is safe as long as the label instructions are followed.

Can this be used on donkeys?

Answer by Chewy • Jun 23, 2025
This product should be administered according to label directions. For questions beyond label directions, please contact the manufacturer.
Reviews
Write a Review
5.0
Rated 5 out of 5 stars
22 Ratings
Terms & Conditions

13 Customer Reviews

Rated 5 out of 5 stars
By Tish on Dec 2, 2025

Ease of use

I dud notice they both gave a shake after I applied it - I assumed it must've tingled

I dud notice they both gave a shake after I applied it - I assumed it must've tingled

Rated 5 out of 5 stars
By Amanda on Aug 27, 2025

Great Fly Treatment

I’m so happy I tried Ultra Boss. It works better than any other product I’ve tried. No flies after treatment and easy to use. And it was cheaper than the alternatives,

I’m so happy I tried Ultra Boss. It works better than any other product I’ve tried. No flies after treatment and easy to use. And it was cheaper than the alternatives, a win win!

Rated 5 out of 5 stars
By Brenda on Jun 1, 2025

Works great for our longhorns!

The flies were ganging up on our longhorns. We poured this down their backs as directed, and they had immediate relief. They were able to rest in the pasture with

The flies were ganging up on our longhorns. We poured this down their backs as directed, and they had immediate relief. They were able to rest in the pasture with no tail swishing or ear twitching. It can be used no more than every 2 weeks. The good news is that it does provide relief for that duration before the flies start coming back heavy. This can also be used as a premise spray which is also helpful. Highly recommend and we will keep this around!

Rated 5 out of 5 stars
By Rachel on Jul 5, 2025

This stuff works!

Our vet recommended this product for our horses. We have one who is pretty sensitive to flies and this has been an absolute game changer for her.

Our vet recommended this product for our horses. We have one who is pretty sensitive to flies and this has been an absolute game changer for her.

Rated 5 out of 5 stars
By Thomas on Oct 11, 2025

Was recommended

This stuff really works! Don your PPE and go fly-free

This stuff really works! Don your PPE and go fly-free

Rated 5 out of 5 stars
By Susan on Jul 29, 2025

Horse eating flies & ticks

It’s really helping ward off the ticks & flies in my 3 horses.

It’s really helping ward off the ticks & flies in my 3 horses.

Rated 5 out of 5 stars
By Shanda on Jun 15, 2025

Best product on the market

This product protects against flies and ticks, best in the market

This product protects against flies and ticks, best in the market

Rated 5 out of 5 stars
By Donna on Jun 14, 2025

Great Pricing

This is the best-pour on. And your price is the best price.

This is the best-pour on. And your price is the best price.

Rated 5 out of 5 stars
By Tammy on Jun 4, 2025

Have used this for years on our sheep

Glad to know that Chewy has this available! Good product!

Glad to know that Chewy has this available! Good product!

Rated 5 out of 5 stars
By Ellen on Aug 18, 2025

Cleared the flies off the bull

Good fly control on cattle

Good fly control on cattle