Hartz UltraGuard Dual Action Flea & Tick Spot Treatment for Dogs 61-150 lbs+, 3 Doses (3-mos. supply)

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About This Item

Details

  • This topical formula is designed to protect your canine companion against fleas and ticks including brown dog ticks and deer ticks.
  • One application of UltraGuard Dual Action formula keeps your pal protected from pesky pests for up to 30 days.
  • Tick and flea solution may also prevent re-infestation for the convenience of both pets and pet parents alike.
  • UltraGuard Dual Action treatment breaks the flea life cycle so that your dog can continue to do what he loves.
  • This topical solution is suitable for dogs between 61-150 pounds and comes with 3 monthly treatments.

Ingredients

Instructions

FAQ

Learn More About Hartz 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 Hartz UltraGuard Topicals for Dogs

Why Choose a Flea & Tick Topical?

Hartz UltraGuard topicals provide monthly non-stop flea and tick protection. Just apply directly to your dog’s skin—they’re fast-acting and help prevent reinfestation for up to 30 days!

How Hartz Flea & Tick Topicals Work

Hartz UltraGuard topical formulations utilize your dog’s natural oil composition to spread their active ingredients across the skin. Once applied, the monthly formula moves across the skin and hair for full body protection.

How to Apply Hartz Flea & Tick Topicals

Step 1: Open the package and remove one tube.

Step 2: Break the seal by twisting the dispenser tip while pushing down.

Step 3: Position the dispensing tip on your dog’s back between the shoulder blades.

Step 4: Apply the topical directly to the skin, from the shoulders to the base of the tail.

Monthly Flea & Tick Protection

Pest Protection

Hartz UltraGuard dog topicals help kill and prevent fleas and ticks for up to 30 days, offering full-body protection.

Fast-Acting

Once applied, UltraGuard topicals start killing fleas in as little as 15 minutes.

Waterproof

UltraGuard offers full waterproof protection for 48 hours after application, so it keeps working even if your dog gets wet.

Pro-Glide Applicator

Hartz UltraGuard PRO Topical has a specially angled applicator for easy, mess-free application.

About Hartz

For more than 95 years, Hartz has been dedicated to creating products that show pets the same unconditional love they give us. Hartz is a leader in quality, innovative products for dogs and cats, including Oinkies, Delectables, UltraGuard, Nature’s Shield, Home Protection, Comfitables, and Groomer's Best brands. Through the Hartz Loving Paws shelter outreach program, Hartz is committed to helping animal welfare organizations that protect and care for pets until they find their forever homes.

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Questions & Answers

15 Customer Questions


Do you applie the whole thing monthly or just some.

Answer by ChewyOct 16, 2018
When applying the treatment, you should use one full applicator tube.

Does this wear off from bathing, and if used with an anti flea and tick shampoo?

Answer by ChewyNov 19, 2018
This flea treatment is waterproof after 48 hours of application.

The Ultra Guard, Flea & Tick Drops for Small dogs, says, will be effective for UP TO a month... Can it be used more often (weekly or every other week) if needed??

Answer by ChewyAug 15, 2018
Repeat this product once a month. Do not repeat dosage in less than 30 days. This can cause an overdose of the treatment which is a health hazard to your dog.

MY DOG ROLLED I. GRASS RIGHT AFTER HARTZ DUAL ACTION WAS APPLIED. WILL IT STILL BE EFFECTIVE?

Answer by ChewyJun 23, 2021
The Hartz UltraGuard will remain effective for 30 day once applied.

4.1
Rated 4.1 out of 5 stars
267 Ratings

Customers Mention

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

Ease of Use

83% Positive

Effectiveness

83% Positive

Ingredients

84% Positive

Long-Term Benefits

82% Positive

82 Customer Reviews



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

Rated 1 out of 5 stars
By Teresa on Dec 17, 2025

Did Not Work

After 2 months of treatment it was clear that the product did not work.

After 2 months of treatment it was clear that the product did not work.


Rated 2 out of 5 stars
By Bridgette on Nov 6, 2025

Overwhelming smell

Doesn’t work my pets snell like flea meds but it doesn’t kill the fleas.

Doesn’t work my pets snell like flea meds but it doesn’t kill the fleas.


Rated 1 out of 5 stars
By Miyoshia on Jan 3, 2026

Dogs

Actually see less fleas, not all gone

Actually see less fleas, not all gone


Rated 1 out of 5 stars
By Jessica on Sep 15, 2025

Doesn’t work

Cheap product offers cheap results. Don’t even waste your time or money on this product

Cheap product offers cheap results. Don’t even waste your time or money on this product


Rated 5 out of 5 stars
By Spencer on Jul 15, 2025

A great alternative at a reasonable price

Our pet has used for several years. He has not had any bad reactions to the medicine and it has controlled the flea and ticks.

Our pet has used for several years. He has not had any bad reactions to the medicine and it has controlled the flea and ticks.


Rated 5 out of 5 stars
By Janet on Aug 7, 2025

Easy to use tick and flea protection

Kooper is more comfortable with less scratching and lots of running on the yard.

Kooper is more comfortable with less scratching and lots of running on the yard.


Rated 5 out of 5 stars
By Barbara on Aug 22, 2025

It works.

I have been using this for years and never had a problem.

I have been using this for years and never had a problem.


Rated 5 out of 5 stars
By Mike on Jun 9, 2025

Great Price

works just as good as the other brands but at a fraction of the cost, will forever buy this brand

works just as good as the other brands but at a fraction of the cost, will forever buy this brand


Rated 5 out of 5 stars
By Fran on Oct 18, 2025

Efficient caring fast kind and compassionate

you guys are great thank you

you guys are great thank you


Rated 5 out of 5 stars
By Joy on Apr 25, 2025

Good Product

I used this brand for couple of years on my German Shepherd. We never ever saw any fleas on her and it is much cheaper than other brands.

I used this brand for couple of years on my German Shepherd. We never ever saw any fleas on her and it is much cheaper than other brands.