NexGard Chewable Flea & Tick Tablets for Dogs
NexGard has been a game-changer for dog owners who are tired of greasy topical treatments that rub off on their furniture or kids. It's a monthly beef-flavored chew that most dogs gobble up like a treat, and it starts killing fleas within 4 hours of the first dose. (NexGard FAQ)
Pros
- Fast-acting. Kills fleas within 4 hours
- Also kills 5 tick species including black-legged ticks
- Tasty beef flavor that dogs love
Cons
- Requires a vet prescription in some regions
- Not suitable for puppies under 8 weeks or under 4 lbs
Frontline Plus Flea and Tick Treatment for Dogs
Frontline Plus has been a trusted name in flea control for decades, and it still holds up in 2026 thanks to its dual-action formula that kills both adult fleas and disrupts the flea lifecycle by targeting eggs and larvae. It's waterproof within 24 hours, making it a solid pick for dogs who love to swim or need frequent baths. (Frontline)
Pros
- Kills fleas, ticks, and lice
- Waterproof after 24 hours
- No prescription needed. Available over the counter
Cons
- Some owners report that a product stopped working for their dog
- Greasy application spot can irritate sensitive dogs
Sentry Fiproguard Plus Flea & Tick Squeeze-On for Dogs
If you have a multi-dog household, Sentry Fiproguard Plus delivers solid flea and tick protection using fipronil and S-methoprene, the same active ingredients as other fipronil-based spot-ons. It's not quite as polished an experience as some of the other picks, but for everyday flea prevention it genuinely gets the job done.
Pros
- Fipronil + S-methoprene formula
- Practical for households with multiple dogs
- Kills flea eggs and larvae to break the lifecycle
Cons
- Scent can be strong
- May be less effective in heavy infestation situations
Capstar Fast-Acting Oral Flea Treatment for Dogs
Capstar is the product you reach for when your puppy comes home covered in fleas and you need results within the hour. It starts killing adult fleas in as little as 30 minutes. The manufacturer lists use for puppies as young as 4 weeks and weighing at least 2 lbs. (Capstar)
Pros
- Kills adult fleas within 30 minutes
- Safe for puppies as young as 4 weeks
- Can be given daily if needed, per the manufacturer's label
Cons
- Only kills adult fleas. Does not prevent reinfestation
- No tick protection whatsoever
Vet's Best Flea and Tick Home Spray for Dogs
For pet parents who prefer to avoid synthetic pesticides whenever possible, Vet's Best uses plant-based ingredients like peppermint oil and eugenol (clove extract), which are marketed to repel and kill fleas. It's not as fast or as long-lasting as chemical treatments, but it may help as part of a broader flea control routine and smells genuinely pleasant in your home.
Pros
- Plant-based formula safe around kids and other pets when dry
- Can be used on dog bedding, furniture, and carpets too
- Smells fresh and clean. No harsh chemical odor
Cons
- Needs more frequent application than chemical alternatives
- May not be strong enough for an established heavy infestation on its own
If you have cats in the house too, our Best Flea Prevention for Cats 2026 Complete Guide is a must-read, because treating just your dog may not stop fleas carried over from your cat.
What Is Bravecto QUANTUM and Why It Matters in 2026
The biggest flea and tick news for dog owners is Bravecto QUANTUM (fluralaner extended-release injectable suspension) from Merck Animal Health, known as MSD Animal Health outside the United States. The FDA approved it on July 10, 2025.[1][2]
What makes it different is that it is a single subcutaneous injection given by a veterinarian between the shoulder blades. The FDA-approved label covers fleas and certain tick species for up to 12 months, and lone star ticks for 8 months.[2] The FDA describes it as the first FDA-approved drug that protects dogs against fleas and ticks for 8 to 12 months.[1]
It is approved for dogs and puppies 6 months of age and older.[1] The vet weighs your dog first and calculates the dose.
The trade-offs are worth knowing before you ask your vet about it. It is a prescription product given only in a veterinary clinic, and the up-front cost is higher than a box of chews. Because it is a single injection given by a vet, a dose cannot be skipped or reversed at home, so ask your vet about side effects before you agree to it. It is not approved for cats.
As an isoxazoline, fluralaner carries the same class-level FDA safety advisory as every other product in this family, which we cover in the next section.
The FDA Isoxazoline Safety Advisory
The FDA has issued a safety fact sheet on isoxazoline flea and tick products. It notes that muscle tremors, ataxia (wobbliness), and seizures have been reported in some dogs, including dogs with no prior seizure history.[3]
The FDA states that it considers isoxazoline products safe and effective for dogs and cats, and its fact sheet says most dogs and cats have no neurologic reactions.[3] The practical takeaway is to talk with your vet before using any isoxazoline product if your dog has a history of seizures or neurologic problems, and to keep an eye on your dog for unusual behavior in the days after a new dose.
The Isoxazoline Family at a Glance
Bravecto, NexGard, and Simparica Trio are prescription chews, and Revolution Plus is a monthly topical for cats. They all belong to the isoxazoline class, which acts by blocking GABA- and glutamate-gated chloride channels in arthropod nerve cells.[4][5]
| Product | Active ingredients | Format and interval | Flea and tick spectrum | Heartworm coverage | Safety note |
|---|---|---|---|---|---|
| Bravecto (chew) | Fluralaner | Chew every 12 weeks | Fleas plus 4 tick species | No, pair with a separate heartworm preventive | Isoxazoline class advisory |
| NexGard | Afoxolaner | Chew every 28-30 days | Fleas plus 4 tick species | No, pair with a separate heartworm preventive | Isoxazoline class advisory |
| Simparica Trio | Sarolaner + moxidectin + pyrantel | Chew every 28-30 days | Fleas plus 5 tick species, roundworms, hookworms | Yes | Isoxazoline class advisory |
| Revolution Plus (cats) | Selamectin + sarolaner | Monthly topical | Fleas, 4 tick species, ear mites, roundworms, hookworms | Yes | Isoxazoline class advisory |
If heartworm coverage matters to you and you prefer one product over several, Simparica Trio (for dogs)[6] or Revolution Plus (for cats)[7] are the single-product options. If you want the longest dosing interval, Bravecto covers 12 weeks per chew[8], and Bravecto QUANTUM pushes that to 12 months per injection.[2]
What the "isoxazoline class advisory" in that table actually is
It is not our caveat and it is not a marketing disclaimer. In September 2018 the US Food and Drug Administration issued a formal alert about this whole drug class, and it still stands. The FDA states that these products have been associated with neurologic adverse reactions, including muscle tremors, ataxia and seizures in some dogs and cats, in animals with no prior history of seizures.
Read the rest of the FDA's wording too, because it cuts both ways: the agency says these drugs "can and have been safely used in the majority of dogs and cats" and continues to consider them safe and effective. It is not a reason to leave your dog unprotected against fleas and ticks. What it is: a reason to tell your vet if your dog has ever had a seizure, before you accept a prescription from this class.
Sources for this section, so you can read them without us in the middle:
- FDA, Fact Sheet for Pet Owners and Veterinarians about Potential Adverse Events Associated with Isoxazoline Flea and Tick Products — the named products, the reported reactions, and the FDA's own assessment of the risk.
Quick Comparison
| Product | Best For |
|---|---|
| NexGard Chewable Tablets | Overall best performance |
| Frontline Plus | Best waterproof topical |
| Sentry Fiproguard Plus | Multi-dog households |
| Capstar Oral Treatment | Best for puppies and fast relief |
| Vet's Best Home Spray | Best natural/chemical-free option |
Our Top Pick
NexGard Chewable Tablets take the top spot because they combine ease of use, fast flea-killing action, and broad tick protection into one treat your dog will actually beg for. If you can get a prescription from your vet, it is the top pick here.
Related guides worth reading next: Best Joint Supplements for Dogs: 5 Top Picks, Best Dog Dental Chews: Keep Your Pup's Teeth Clean and Best Pet Supplements & Health Products.
Frequently Asked Questions
Willemijn has kept animals for around 45 years. She did not have these particular items in her own home. What follows is her read on them, put together from research and from what she has seen at other owners' houses. We keep it separate from her hands-on notes on purpose, because the two are not the same thing.
Sentry Fiproguard Plus. Works, but it smells chemical. Drawback: The smell.
Vet's Best Flea & Tick Spray. Does not work well. Drawback: It does not work.
Willemijn is a friend of the founder and is not paid for this.