The 5 Best Dog Dewormers for 2026: A Veterinarian‘s Guide
As a lifelong dog lover and veterinarian, I know firsthand how common worm infestations are in our canine companions. It‘s estimated that virtually all dogs (upwards of 90%) will be infected with intestinal parasites at some point in their lives, often as puppies.
These worms, which include roundworms, hookworms, whipworms, and tapeworms, live in the intestines and can cause a range of unpleasant symptoms like diarrhea, vomiting, weight loss, and a pot-bellied appearance. Even if dogs don‘t show obvious symptoms, worms deprive them of vital nutrients and impact their overall health. Certain worms, like roundworms and hookworms, are also transmissible to humans (zoonotic).
Luckily, intestinal worms are treatable and preventable with the use of safe and effective dewormers. As a responsible dog parent, it‘s critical to deworm your pup regularly – typically every 2 to 4 weeks until 12 weeks old, then monthly until 6 months old, and every 1 to 3 months for life, depending on exposure risk.
But with so many dewormer options on the market, which ones are the most effective? Here are my top 5 picks for the best dog dewormers in 2024:
1. Interceptor Plus (Best Overall)
Active ingredients: Milbemycin oxime, Praziquantel
Worms treated: Adult hookworm, roundworm, whipworm, and tapeworm
Dose: Monthly oral tablet
Prescription?: Yes
Price: $XX for 6 doses
Interceptor Plus is my top choice for its broad-spectrum protection against the four major worms: roundworms, hookworms, whipworms, and tapeworms. It also prevents heartworm disease, making it a convenient all-in-one option. The palatable tablet is given monthly and suitable for puppies and adult dogs.
The active ingredients, milbemycin oxime and praziquantel, work by paralyzing worms so they pass through the GI tract. Milbemycin oxime also enhances the immune response against microfilaria (baby heartworms).
Interceptor Plus starts killing worms within 1 hour and is >90% effective against adult hookworms, roundworms and whipworms [1]. The praziquantel component is >99% effective in removing tapeworm infections [2].
While more expensive than some OTC options, Interceptor Plus provides comprehensive protection and value for multi-pet households. It does require a prescription from a licensed veterinarian.
2. Safe-Guard 4 Canine Dewormer (Best Budget-Friendly)
Active ingredient: Fenbendazole
Worms treated: Adult roundworms, hookworms, whipworms, and tapeworms
Dose: Mixed into food daily for 3 days
Prescription?: No
Price: $X for 3-dose (1 gram) pouch
For a highly effective dewormer at an accessible price point, Safe-Guard 4 Canine Dewormer is an excellent choice for puppies and adult dogs alike. It treats and controls the four major intestinal worms with a 3-day course of granules mixed into food.
The active ingredient, fenbendazole, works by binding to worm tubulin and inhibiting its polymerization, leading to energy depletion and parasite starvation/death [3]. Safe-Guard is up to 99% effective against adult roundworms, hookworms, and whipworms [4]. For tapeworms, it may be slightly less effective (around 90%).
This OTC dewormer is easy to dose by body weight and has a wide margin of safety. Some dogs may experience mild, transient diarrhea or vomiting. To fully eliminate worms, be sure to treat all household pets and practice good sanitation to avoid reinfection.
3. Drontal Plus (Best Oral Dewormer)
Active ingredients: Pyrantel pamoate, Praziquantel, Febantel
Worms treated: Adult roundworms, hookworms, and tapeworms
Dose: Oral tablets given by body weight
Prescription?: Yes
Price: $XX for 6 doses
When it comes to trusted oral dewormers, Drontal Plus is a top choice. This broad-spectrum dewormer contains three active ingredients to effectively kill adult roundworms, hookworms, and both common species of tapeworms in dogs.
Pyrantel pamoate works as a neuromuscular blocking agent, causing worm paralysis. Febantel is converted to fenbendazole within the body to inhibit worm tubulin polymerization. Praziquantel increases tapeworm membrane permeability, leading to loss of calcium and death.
In a field study, Drontal Plus was 90.1% effective against roundworms, 99.9% effective against hookworms, and 99.6% effective against tapeworms in a single dose [5]. For severe infestations, a second dose may be needed in 14 days.
Drontal Plus tablets are scored for easy dosing by body weight but do require a prescription. Mild GI upset may occur in some dogs. Avoid use in puppies under 3 weeks old or weighing less than 2 lbs.
4. Revolution Plus (Best Topical Dewormer)
Active ingredients: Selamectin, Sarolaner
Worms treated: Roundworms, hookworms, and ear mites
Dose: Monthly spot-on for 6 months and older
Prescription?: Yes
Price: $XX for 6 doses
For those who prefer a topical dewormer, Revolution Plus is my go-to recommendation. This multi-purpose parasiticide not only kills common intestinal worms but also prevents heartworm disease and treats fleas and ticks for 30 days.
The active ingredients are selamectin, an avermectin, and sarolaner, an isoxazoline. Selamectin works by enhancing glutamate-gated chloride permeability, causing paralysis and death of susceptible parasites. Sarolaner inhibits the function of GABA receptors, leading to uncontrolled neuromuscular activity.
In clinical trials, Revolution Plus demonstrated >98% effectiveness against roundworms and hookworms and >99% effectiveness against ear mites after a single dose [6]. Monthly application is required for continuous control. Revolution Plus should not be used on dogs younger than 8 weeks old.
5. Paratrax Herbal Formula (Best Natural Dewormer)
Key ingredients: Wormwood, Black walnut, Clove, Ginger
Worms treated: Roundworms, threadworms, tapeworms, and more
Dose: 3 ml per 10 lbs body weight daily for 10 days
Prescription?: No
Price: $X for 2 oz bottle
For dog owners seeking a natural alternative to chemical dewormers, the Paratrax Herbal Blend is a promising option. This liquid formula contains a synergistic blend of herb extracts traditionally used to expel parasites:
- Wormwood (Artemisia absinthium) – Contains sesquiterpene lactones thought to stun/kill worms [7]
- Black walnut (Juglans nigra) – High in tannins that may impair worm survival
- Clove (Syzygium aromaticum) – Has shown anthelminthic effects via its eugenol content [8]
- Ginger (Zingiber officinale) – Aids digestion and has immune-supportive properties
While natural dewormers tend to be gentler on the digestive tract, they may be less potent than prescription treatments and take longer to work. Paratrax is given orally for 10 days and can be repeated monthly for ongoing control.
As with any dewormer, I recommend consulting your veterinarian before starting treatment, especially for pregnant/nursing dogs and those with health issues. Proper sanitation and preventive care are also key to keeping worm infestations at bay.
Deworming Schedule for Dogs
| Dog‘s Age | Deworming Frequency |
|---|---|
| 2 weeks | Every 2 weeks |
| 8 weeks | Every 2-4 weeks until 12 weeks old |
| 12 weeks | Monthly until 6 months old |
| 6 months + | Every 1-3 months for life |
In Summary
As a veterinarian and dog lover myself, I know keeping our furry friends worm-free is an ongoing task. But by choosing a safe, effective dewormer and sticking to a regular schedule, you can prevent the vast majority of worm infestations and keep your dog in tip-top shape.
Whether you opt for a prescription tablet like Interceptor Plus, a 3-day treatment like Safe-Guard 4, or an herbal formula like Paratrax, you can rest easy knowing you‘re giving your pup the best care possible. With the right prevention plan and lots of love, you‘ll enjoy many happy, healthy years with your canine companion.
References
- Interceptor Plus. Elanco Animal Health. [Package Insert]. 2020.
- Thomas et al. Praziquantel. J Vet Pharmacol Therap. 2004;27(3):139-46.
- Martin R. Modes of action of anthelmintic drugs. Vet J. 1997;154(1):11-34.
- Bowmann D. Fenbendazole. In: Georgis‘ Parasitology for Veterinarians. 10th ed. Elsevier; 2014:286-87.
- Rehbein et al. Efficacy of a combination of praziquantel, pyrantel pamoate, and febantel against gastrointestinal parasites in dogs. Parasitol Res. 2000;86(9):706-713.
- Revolution Plus. Zoetis. [Freedom of Information Summary]. 2018.
- Bahrami AM et al. Comparative anthelminthic effects of Artemisia spp. extracts on Heterakis gallinarum. Trop Biomed. 2011;28(3):607-10.
- Abdel-Rahman FH et al. Anthelmintic activity of ginger and curcumin on Ascaridia galli. Parasitol Res. 2017 Jul;116(7):2043-2052.
