Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
Advertising Disclosure
10 Best flea drops of 2026
Explore top picks
1
K9 AdvantixK9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21 - 55 lbs. | 4-Mo Supply
9.7Exceptional
Our Rating
-
-
Powerful technology We scan thousands of products and stores, analyzing reviews to find what matters most to users like you
Careful review Our team ensures quality, value, and fit based on real user feedback
Trusted insights AI and human analysis guide your decisions, reflecting real user prioritiesReal users impact
Thousands of users trust our site daily
- Based on millions of stores and reviews
- Shoppers influence our rankings
Analyzing top stores
2
K9 AdvantixK9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21 - 55 lbs. | 4-Mo Supply
9.5Excellent
Our Rating
-
3
PetArmorPetArmor Plus Flea and Tick Prevention for Dogs, Small Dog Flea and Tick Treatment, 3 Doses, Waterproof Topical, Fast Acting (5-22 lbs)
9.3Excellent
Our Rating
-
4
PetArmorPetArmor Plus Flea and Tick Prevention for Dogs, Small Dog Flea and Tick Treatment, 3 Doses, Waterproof Topical, Fast Acting (5-22 lbs)
9.1Excellent
Our Rating
-
5
K9 AdvantixK9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 2-Mo Supply
Key specs-
Target Weight:11-20 lbs
-
Application Method:Topical
-
Waterproof:After 24 hours
-
Treatment Duration:30-day
-
Protection Type:Fleas, ticks, mosquitoes
8.9Very Good
Our Rating
-
-
See Today’s Deals & Prices
6
K9 AdvantixK9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 2-Mo Supply
Key specs-
Target Weight:11-20 lbs
-
Application Method:Topical
-
Waterproof:After 24 hours
-
Treatment Duration:30-day
-
Protection Type:Fleas, ticks, mosquitoes
8.7Very Good
Our Rating
-
7
Amazon BasicsAmazon Basics Preventative Flea and Tick Topical Treatment for Dogs, Large (45-88 lbs), Fast Acting and Long Lasting, 3 Counts, Packaging May Vary
8.6Very Good
Our Rating
-
8
Amazon BasicsAmazon Basics Preventative Flea and Tick Topical Treatment for Dogs, Large (45-88 lbs), Fast Acting and Long Lasting, 3 Counts, Packaging May Vary
8.5Good
Our Rating
-
9
HartzHartz UltraGuard Topical Flea & Tick Prevention for Cats and Kittens - 3 Monthly Treatments
Key specs-
Target Weight:5 pounds and over
-
Application Method:Topical drop
-
Duration:Repels mosquitoes for 18 days
-
Kill Time:N/A
-
Active Ingredients:N/A
8.2Good
Our Rating
-
10
HartzHartz UltraGuard Topical Flea & Tick Prevention for Cats and Kittens - 3 Monthly Treatments
Key specs-
Target Weight:5 pounds and over
-
Application Method:Topical drop
-
Duration:Repels mosquitoes for 18 days
-
Kill Time:N/A
-
Active Ingredients:N/A
7.9Good
Our Rating
-
