Is Sentry Fiproguard the same as Frontline?

Both use fipronil as the active ingredient, but Fiproguard is a store-brand formula at a lower price. Frontline's exact carrier ingredients differ, so reactions can vary between the two.

Can I use this on my cat?

No. The label warns against use on cats, and fipronil spot-ons formulated for dogs can cause serious reactions in cats. Keep treated dogs away from cats until the product dries.

How often do I apply it?

One tube per month, applied to the skin between the shoulder blades. Each dose is labeled to last up to 30 days and stays waterproof.

Does it kill flea eggs and larvae?

No. It targets adult fleas and ticks. If you have an active infestation, you also need to treat the home and yard or use a product with an insect growth regulator.

Is it safe for a pregnant dog?

The label lists pregnant, breeding and lactating dogs as suitable. Check with your vet if your dog has skin conditions or is on other medications.

When is the price lowest?

The three-month pack was $17.99 at Chewy.com as of November 4, 2026. Multi-packs usually cost less per dose than single tubes, so watch for seasonal flea-season sales.

Where is the Sentry Fiproguard Flea & Tick cheapest?

At Chewy.com, for $17.99, as of our latest check.

What do buyers say about the Sentry Fiproguard Flea & Tick?

Rated 3.8 out of 5 from 898 ratings.

Where can I buy the Sentry Fiproguard Flea & Tick?

24 stores we checked sell it, including Chewy.com, Petco.com, Amazon, Walmart, Pet Goods.

Sentry Fiproguard Flea & Tick

3.8

Best price now

$17.99at Chewy.comObserved at 5:11 AM

Compared across 2 stores. Prices are checked against each store and labelled with when.

Visit Chewy.com

Sentry Fiproguard Flea & Tick

3.8

Best price now

$17.99at Chewy.comObserved at 5:11 AM

Compared across 2 stores. Prices are checked against each store and labelled with when.

Visit Chewy.com

Ask our shopping agent

Our take on the Sentry Fiproguard Flea & Tick

Sentry Fiproguard is a monthly spot-on flea and tick treatment for dogs weighing 23 to 44 lbs. Each tube delivers 9.70% fipronil, the same active ingredient class used in Frontline, and stays waterproof for up to 30 days. The three-month pack is $17.99 at Chewy.com as of November 4, 2026, roughly $6 per dose, which is well below typical vet-channel spot-ons.

Best forOwners of medium dogs (23–44 lbs)Budget-minded monthly flea and tick preventionHouseholds with pregnant, breeding or lactating dogsDogs that swim or get bathed often

Pros

Fipronil 9.70% targets fleas and ticks
Waterproof for up to 30 days per dose
Odorless topical, no pill to hide
Three-month supply for about $6 per month
Labeled safe for pregnant, breeding and lactating dogs

Cons

Only for dogs 23–44 lbs; wrong size means a separate pack
Kills adult fleas only, not eggs or larvae
Not for cats, and toxic to them if applied
Some dogs show skin irritation at the application site
Flea and tick resistance to fipronil is documented in some regions

Sentry Fiproguard Flea & Tick prices at every store

Chewy.comNew
In stock
$17.99Observed at 5:11 AM
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Petco.comNew
In stock
$17.99Observed at 5:11 AM
Visit store

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eBayCheck price at eBay
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Sentry Fiproguard Flea & Tick price history

Lowest price we've seen: $14.99 on Nov 4 at Cherrybrook. Tracked across 24 stores since Nov 4.

What reviewers say

Ratings average 3.8 out of 5 from 898 reviews. Many owners say it controls fleas at a low price, while others report irritation or that fleas kept coming back.

Pros

Noticeably cheaper than vet brands
Works for many dogs with no side effects
Easy to apply and dries quickly

Cons

Skin redness or itching at the spot
Fleas returning within the month for some dogs
Strong smell right after application for some users

Specifications

Targeted Pests: Fleas, Ticks
Active Ingredient: Fipronil
Administration Method: Topical solution, Spot-on
Life Stage Age: Adult
Treatment Frequency: Monthly
Dosage Concentration: 9.70% (fipronil)
Dosage Duration: Up to 30 days
Formulation Type: Topical Solution, Spot-on
Formulation: Waterproof
Lifecycle Targeted: Adult fleas
Animal Type: Dogs
Suitable For Health Status: Pregnant dogs, Breeding dogs, Lactating dogs
Treatment Type: Treatment, Prevention
Supply Duration: 3 month supply
Supply Amount: 0.07 Fluid Ounces
Weight Range: 23-44 lbs
Breed Restrictions: Do not use on cats
Contains: Fipronil
Free Of: Allergen-Free
Package Type: Pack
Scent: Odorless

Questions and answers

Is Sentry Fiproguard the same as Frontline?: Both use fipronil as the active ingredient, but Fiproguard is a store-brand formula at a lower price. Frontline's exact carrier ingredients differ, so reactions can vary between the two.
Can I use this on my cat?: No. The label warns against use on cats, and fipronil spot-ons formulated for dogs can cause serious reactions in cats. Keep treated dogs away from cats until the product dries.
How often do I apply it?: One tube per month, applied to the skin between the shoulder blades. Each dose is labeled to last up to 30 days and stays waterproof.
Does it kill flea eggs and larvae?: No. It targets adult fleas and ticks. If you have an active infestation, you also need to treat the home and yard or use a product with an insect growth regulator.
Is it safe for a pregnant dog?: The label lists pregnant, breeding and lactating dogs as suitable. Check with your vet if your dog has skin conditions or is on other medications.
When is the price lowest?: The three-month pack was $17.99 at Chewy.com as of November 4, 2026. Multi-packs usually cost less per dose than single tubes, so watch for seasonal flea-season sales.
Where is the Sentry Fiproguard Flea & Tick cheapest?: At Chewy.com, for $17.99, as of our latest check.
What do buyers say about the Sentry Fiproguard Flea & Tick?: Rated 3.8 out of 5 from 898 ratings.
Where can I buy the Sentry Fiproguard Flea & Tick?: 24 stores we checked sell it, including Chewy.com, Petco.com, Amazon, Walmart, Pet Goods.