The 8 Best Flea and Tick Prevention Products for Dogs of 2023

Best Overall

Simparica Chewables for Dogs

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Simparica Chewables are liver-flavored tablets that provide a full month of protection from fleas and ticks with a single dose. Using a Simparica chewable is straightforward—there’s no need to give it to your dog with food, and it has a tested efficacy of 35 days. 

Simparica kills fleas that are already on your dog within four hours of your dog eating the chewable. It is effective at curbing an infested household too, since Simparica kills fleas faster than they can lay eggs, disrupting the life cycle. 

Similarly effective against ticks, Simparica will kill ticks on your dog within 24 hours—fast enough to potentially prevent transmission of diseases like Rocky Mountain spotted fever or Lyme disease. In one study of 24 dogs, the active ingredient in Simparica retained its efficacy throughout the month, outperforming the active ingredient in NexGard Chewables.While conducted according to guidelines established by the World Association for the Advancement of Veterinary Parasitology (WAAVP), it’s worth noting that the study was funded by Zoetis, the manufacturer of Simparica—a common practice that nevertheless presents a conflict of interest.

The active ingredient in Simparica, sarolaner, overloads the nervous systems of parasites by targeting a chemical pathway found in arthropods, but not mammals. Sarolaner is in the same class of chemicals as the afoxolaner found in NexGard and the fluralaner found in Bravecto, but was developed and approved more recently. It has been tested and found effective against a wider variety of ticks than some of its most popular competitors.

While side effects are typically mild and rare, you should keep an eye out for vomiting and diarrhea after giving your dog Simparica. The class of chemicals found in Simparica and similar treatments have also been linked to what the FDA calls in a 2021 fact sheet “neurologic adverse events in dogs and cats,” so it’s particularly important to seek medical attention if your dog has seizures, tremors, or trouble walking. Such side effects are rare enough that the FDA continues to describe this class of drugs as “safe and effective.”

Another potential downside of using Simparica is that it requires a veterinary prescription, though prescription drugs should be considered the primary method for warding off fleas and ticks.

Simparica is available in six different formulations, depending on your dog’s weight. Simparica is also available in 3-month, 6-month, and 12-month supplies.

Price at time of publish: $57 (3-month supply for medium-sized dog)

_{Delivery Method: Chewable | Active Ingredients: Sarolaner | Effective Against: Fleas and Ticks | Quantity: 3-, 6-, 12-month supply}

Best Non-Prescription

Frontline Plus For Dogs Flea & Tick Spot Treatment

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When it comes to warding off fleas and ticks, we recommend consulting with your veterinarian and seeking a prescription treatment. “Products prescribed by veterinarians are the best to use [for flea and tick prevention],” Dr. Wolfe told The Spruce Pets. “Veterinarians can advise which product would be best for your pet and how to use it properly.”

However, if you’re looking for a non-prescription solution, your best option is Frontline Plus. It’s a little more of a hassle to apply than a simple chewable, but it’s an well-tested, effective, and frequently veterinarian-recommended solution for killing ticks and fleas.

The active ingredients in this topical flea and tick treatment is fipronil, which kills adult fleas and ticks, and (S)-methoprene to kill flea eggs and larvae. By disrupting the flea life cycle at multiple stages Frontline can help reduce local infestations, preventing your dog from picking up fleas over and over. It’s also effective for chewing lice and sarcoptic mites. 

To apply Frontline, you snap open a little tube, then squeeze out the contents onto a patch of skin between your dog’s shoulder blades—a spot where they’re not able to lick. The formula is absorbed through the oil glands and provides a full month of protection. Be sure to keep your dog dry for at least 24 hours after application to ensure the product has soaked in. After that, it’s safe for your dog to go swimming or be around other pets and children.

Price at time of publish: $37 (3-month supply for medium-sized dog)

_{Delivery Method: Topical | Active Ingredients: Fipronil and (S)-methropene | Effective Against: Fleas in all stages, ticks, chewing lice, and sarcoptic mites}

Best for Puppies

NexGard Soft Chew for Dogs

4.8

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The NexGard Soft Chew for Dogs is very similar to our top pick—a highly effective chewable given once a month. We think NexGard is a great choice for most dogs, and only prefer Simparica because of its recently developed active ingredient—which research indicates may be more effective—and because Simparica tends to be more affordable.

The main differences are that NexGard is beef-flavored instead of liver-flavored and can be used in puppies as young as eight weeks, as long as they weigh four pounds or more—Simparica is only recommended for dogs that are six months or older. 

Afoxolaner, the chew’s main ingredient, is absorbed into the bloodstream after ingestion to kill fleas before they have a chance to lay eggs, and ticks, including the Lone Star, black-legged, American dog and brown dog varieties. 

NexGard is FDA-approved and effective in preventing infections that cause Lyme disease. Unlike with some topical treatments, it’s okay if your dog gets wet immediately after ingesting the chews, plus they are safe to use with other pets and children in the household. Available in four types depending on the size of your dog, these chews are ideal for puppies as young as eight weeks weighing at least four pounds. 

While NexGard is safe for use with most dogs, potential side effects to watch for include vomiting, diarrhea, lethargy, loss of appetite, and itching. Its use for pregnant dogs has also not been studied, which is also true of other drugs in this class, like the sarolaner in Simparica. NexGard recommends that people take particular caution when using NexGard with dogs who have a history of “seizures or neurological disorders.” NexGard has released a PDF with more complete prescribing information, which you can share with your veterinarian.

Price at time of publish: $75 (3-month supply for medium-sized dog)

_{Delivery Method: Chewable | Active Ingredients: Afoxolaner | Effective Against: Fleas and ticks}

Best Shampoo

Adams Plus Flea & Tick Shampoo with Precor

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Adams Plus Flea & Tick Shampoo combines the active flea and tick-killing ingredients pyrethrin, s-methropene, and butoxide with itch and skin-soothing ingredients like aloe, oatmeal, lanolin and coconut extract for a creamy, lightly-scented formula.

Great for sensitive-skinned pups, Adams Plus and can be used as-is or diluted with 2 parts water if needed to create a better lather.  A little goes a long way, too— instructions say that 1⅓ tablespoons is all you need per five pounds of pet weight. 

Available in 12-ounce, 24-ounce, or gallon-size containers, this shampoo is safe for dogs and puppies of 12 weeks and older—but you’ll want to be careful not to apply near the eyes. 

While effective at killing fleas, we’re less convinced of its preventative effectiveness. Adams Plus contains an insect growth regulator that the manufacturer claims can prevent flea development for up to 28 days. However, Dr. Melissa Hall, Dutch vet specialist and board certified veterinary dermatologist advised that the shampoo is better used in conjunction with other preventative treatments, telling The Spruce Pets that it’s "good for a current infestation but will not be an effective preventative."

While Adams Plus Flea & Tick Shampoo is generally considered safe for use with cats, we recommend against it, since cats are sensitive to the active ingredient pyrethrin.

Price at time of publish: $15

_{Delivery Method: Topical | Active Ingredients: Pyrethrins, s-methropene, and piperonyl butoxide | Effective Against: Fleas at all stages, ticks, and lice | Size: 12 ounce bottle}

Best for Worms Too

Simparica Trio Chews for Dogs

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Simparica Trio offers the same long-lasting, effective protection against ticks and fleas as Simparica, but also includes active ingredients for preventing worms. Consisting of sarolaner, moxidectin, and pyrantel (the trio), these medications work together to prevent heartworm, hookworm, and roundworm, protect against flea infestations, and also guarding against five types of ticks: the Lone Star tick, Gulf Coast tick, American Dog tick, black-legged tick, and Brown Dog tick. 

A convenient alternative to buying and administering several different medications, these all-in-one chews come in packs of three. Each dose is effective for a full month, and works for a range of dog sizes including puppies of at least eight weeks of age weighing a minimum of 2.8 pounds. They come in liver-flavored bites. 

Price at time of publish: $162 (6-month supply for medium-sized dog)

_{Delivery Method: Chewable | Active Ingredients: Sarolaner, moxidectin, and pyrantel | Effective Against: Fleas, ticks, heartworm, roundworm, and hookworm}

Best Area Treatment

Harris Food Grade Diatomaceous Earth

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Diatomaceous earth is a powdered sedimentary rock containing the fossilized remains of microalgae known as diatoms. Because it is mildly abrasive and highly absorbent, this powder has several practical applications, including as an insecticide. Diatomaceous earth kills fleas, ticks, bedbugs, cockroaches, and other pests by disrupting the waxy outer layer of their exoskeletons and dehydrating them.The powder can be spread anywhere to form an anti-parasite border, plus it is harmless to humans and pets.

We prefer Harris Diatomaceous Earth because it contains zero additives, is registered with the Organic Minerals Research Institute (OMRI), and is both mined and packaged in the United States. It also comes with a powder duster in the bag, which lets you spray powder into the crevices alongside refrigerators and other hard-to-reach places.

You can spread this diatomaceous earth practically anywhere, such as by dusting carpets, surrounding the legs of furniture, placing in corners, or spreading in your yard and garden. It’s best to target problem areas, since the light powder needs to be reapplied occasionally.

Harris Diatomaceous Earth is available in a four pound bag. 10 percent of profits are donated to the Etowah Valley Humane Society in Georgia.

Price at time of publish: $15

_{Delivery Method: Powder | Active Ingredients: Organic, food grade diatomaceous earth | Effective Against: Fleas in all life stages, ticks, cockroaches, bedbugs, carpet beetles, spiders, ants, centipedes, and more}

Best Natural

TropiClean Maximum Strength Natural Flea & Tick Dog Shampoo

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Repel fleas and ticks naturally with your dog’s bath when you suds them up with this product. An excellent choice for sensitive-skinned dogs, Tropiclean Natural Flea and Tick shampoo is equipped with several natural EPA-approved flea, tick, and mosquito repellents, including lemongrass oil, clove oil, cedarwood oil, cinnamon oil, and moisturizing sesame oil. Not only does it work to help kill parasites (adults as well as larvae and eggs) on contact, the Maximum Strength variety also smells fresh and citrus-y for up to a week after use. 

An added benefit is its soap-free quality, using a coconut cleanser to get your pup clean without rinsing away any topical treatments you may have applied prior to bathtime. It also comes in spill-resistant packaging so you won’t waste any if it tips over. Available in 20-ounce or gallon-size shampoo bottles, as well as a spot treatment, collars, home, bedding, and yard sprays, you can choose to add what works best for your household. 

Price at time of publish: $16

^{Delivery Method: Topical (shampoo) | Active Ingredients: Lemongrass oil, cedarwood oil, cinnamon oil, clove oil and sesame oil | Effective Against: Fleas, ticks, and mosquitos}