Reviewed By: Medsdog Team
Last Updated: September 2026
If your vet just handed you a bottle of Panacur and said “give this once a day for a few days,” you’ve probably already discovered the confusing part: how much, exactly? Panacur comes in liquid, granule, and paste forms, each measured differently, and the correct panacur dosage for dogs changes depending on whether you’re doing routine deworming or treating a diagnosed infection like Giardia.
Quick answer: The standard panacur dose for dogs is 50 mg/kg (22.7 mg/lb) of body weight, once daily for 3 days for most intestinal worms, or 5 days for Giardia and 7 days for Lungworm.
Use the panacur dosage calculator below, or the charts further down this page, to get the exact amount for your dog’s weight and formulation.
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Disclaimer: All information in this guide is provided for educational purposes only and should never replace professional veterinary advice.
Panacur Dosage Calculator for Dogs
Estimate the fenbendazole (Panacur®) dose for your dog by formulation and bodyweight.
Estimated dose
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This calculator provides a general estimate based on published Panacur® (fenbendazole) dosing guidelines and is not a substitute for professional veterinary advice. Always confirm the dose and treatment plan with your veterinarian before administering.
Panacur Dosage For Dogs Overview
| Key Point | Details |
|---|---|
| Treatment dose | 50 mg/kg (22.7 mg/lb) once daily |
| Duration | 3 days for most worms; 5 days for Giardia; up to 7 days for lungworm |
| Approved for | Puppies 6+ weeks and pregnant dogs (at an adjusted dose — see below) |
| Available forms | 10% liquid suspension, 22.2% granules, paste |
| Onset | Begins working within hours; dead worms typically appear in stool 24–72 hours later |
| Prescription | Not required in the US (OTC); veterinary diagnosis still strongly recommended |
What Is Panacur® for Dogs and How Does It Work?
Panacur is the brand name for fenbendazole, a benzimidazole-class anthelmintic used to treat gastrointestinal and, in some cases, respiratory parasites in dogs. Unlike dewormers that paralyze worms outright, fenbendazole blocks a protein called tubulin inside parasite cells, cutting off their energy metabolism and starving them over several days.
That’s the reason panacur dosing always runs across multiple consecutive days rather than a single dose when treating an active infection the drug needs sustained exposure to fully clear the parasite.
Fenbendazole has one of the widest safety margins of any veterinary dewormer. In toxicity studies, dogs given 3 times the therapeutic dose for extended periods showed no serious adverse effects, which is part of why the drug is considered safe enough for puppies, pregnant dogs, and debilitated animals under veterinary supervision.
Products containing the same active ingredient:
- Panacur (Merck Animal Health)
- Safe-Guard (Merck same formulation, different labeling for livestock/equine use)
- Generic fenbendazole
If you’re comparing products or already have a jar of the livestock-labeled version on hand, our Safe-Guard dosing chart for dogs breaks down how its concentration and dosing line up gram-for-gram with canine Panacur useful if you’re trying to figure out which product you actually have.
For canines on a generic version instead of the branded product, our complete fenbendazole calculator uses the identical mg/kg math.
Panacur Liquid (10% Suspension) Dosage for Dogs
The ideal Panacur liquid is a 10% oral liquid suspension dosage for dogs depends on the age, weight and type of the treatment.
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- Puppies under 6 months old the ideal 10% Panacur liquid dosage is 0.5ml/kg each day for 3 consecutive days.
- The dose for Pregnant Dogs is 1ml/4kg bodyweight from day 40 of pregnancy to 2 days post whelping.
- For the treatment of Giardia and severe clinical worm infestations in dogs the liquid Panacur dosage will be 1ml/2kg for 3-5 consecutive days.
- For Lungworm treatment in dogs a dose of 1ml/2kg for 7 consecutive days will be administered.
Panacur Liquid (10% Suspension) Dosage Chart for Dogs
| Dog Weight | Puppies <6 Months 0.5 mL/kg | Pregnant Dogs 1 mL/4 kg | Giardia & Severe Worms 1 mL/2 kg | Lungworm 1 mL/2 kg |
|---|---|---|---|---|
| 5 lb (2.3 kg) | 1.15 mL | 0.58 mL | 1.15 mL | 1.15 mL |
| 10 lb (4.5 kg) | 2.25 mL | 1.13 mL | 2.25 mL | 2.25 mL |
| 15 lb (6.8 kg) | 3.40 mL | 1.70 mL | 3.40 mL | 3.40 mL |
| 20 lb (9.1 kg) | 4.55 mL | 2.28 mL | 4.55 mL | 4.55 mL |
| 25 lb (11.3 kg) | 5.65 mL | 2.83 mL | 5.65 mL | 5.65 mL |
| 30 lb (13.6 kg) | 6.80 mL | 3.40 mL | 6.80 mL | 6.80 mL |
| 40 lb (18.1 kg) | 9.05 mL | 4.53 mL | 9.05 mL | 9.05 mL |
| 50 lb (22.7 kg) | 11.35 mL | 5.68 mL | 11.35 mL | 11.35 mL |
| 60 lb (27.2 kg) | 13.60 mL | 6.80 mL | 13.60 mL | 13.60 mL |
| 70 lb (31.8 kg) | 15.90 mL | 7.95 mL | 15.90 mL | 15.90 mL |
| 80 lb (36.3 kg) | 18.15 mL | 9.08 mL | 18.15 mL | 18.15 mL |
| 90 lb (40.8 kg) | 20.40 mL | 10.20 mL | 20.40 mL | 20.40 mL |
| 100 lb (45.4 kg) | 22.70 mL | 11.35 mL | 22.70 mL | 22.70 mL |
Panacur Granules (22.2%) For Dogs Dosage
The Panacur Granules 22.2% (222 mg/g) dosage for dogs is 1 gram of Panacur (fenbendazole) Granules 22.2% for every 4.44 kg (10 lb) of body weight, which is equal to 50 mg/kg (22.7 mg/lb). The dose is given once daily for 3 consecutive days. Use a gram scale to measure the required amount accurately.
| Dog Weight | Body Weight (kg) | Panacur Granules 22.2% Dose |
|---|---|---|
| 5 lb | 2.3 kg | 0.50 g |
| 10 lb | 4.5 kg | 1.00 g |
| 15 lb | 6.8 kg | 1.50 g |
| 20 lb | 9.1 kg | 2.00 g |
| 25 lb | 11.3 kg | 2.50 g |
| 30 lb | 13.6 kg | 3.00 g |
| 40 lb | 18.1 kg | 4.00 g |
| 50 lb | 22.7 kg | 5.00 g |
| 60 lb | 27.2 kg | 6.00 g |
| 70 lb | 31.8 kg | 7.00 g |
| 80 lb | 36.3 kg | 8.00 g |
| 90 lb | 40.8 kg | 9.00 g |
| 100 lb | 45.4 kg | 10.00 g |
Dosage: Give the calculated amount once daily for 3 consecutive days. Use a gram scale to measure the granules accurately.
Panacur® 187.5 mg/g Oral Paste for Dogs Dosage
- The dose of Panacur® 187.5 mg/g oral paste for adult dogs is 1 syringe graduation per 0.5 kg of body weight. The plunger has 18 graduations, with each graduation containing 50 mg of fenbendazole.
- For puppies, the dose is 1 syringe graduation per kg of body weight once daily for 3 consecutive days. Puppies should generally be treated at 2, 5, 8, and 12 weeks of age.
Panacur® 187.5 mg/g Oral Paste Dosage Chart
| Dog Weight | Body Weight (kg) | Adult Dogs: 1 Graduation/0.5 kg | Puppies: 1 Graduation/kg |
|---|---|---|---|
| 5 lb | 2.3 kg | 4.6 graduations | 2.3 graduations |
| 10 lb | 4.5 kg | 9 graduations | 4.5 graduations |
| 15 lb | 6.8 kg | 13.6 graduations | 6.8 graduations |
| 20 lb | 9.1 kg | 18.2 graduations | 9.1 graduations |
| 25 lb | 11.3 kg | 22.6 graduations | 11.3 graduations |
| 30 lb | 13.6 kg | 27.2 graduations | 13.6 graduations |
| 40 lb | 18.1 kg | 36.2 graduations | 18.1 graduations |
| 50 lb | 22.7 kg | 45.4 graduations | 22.7 graduations |
| 60 lb | 27.2 kg | 54.4 graduations | 27.2 graduations |
| 70 lb | 31.8 kg | 63.6 graduations | 31.8 graduations |
| 80 lb | 36.3 kg | 72.6 graduations | 36.3 graduations |
| 90 lb | 40.8 kg | 81.6 graduations | 40.8 graduations |
| 100 lb | 45.4 kg | 90.8 graduations | 45.4 graduations |
How Long Do You Give Panacur?
One of the most common questions we get is “panacur dosage for dogs per kg how many days?” The honest answer: it depends entirely on what you’re treating.
3-Day Standard Protocol (Routine Deworming)
- Targets: Roundworms (Toxocara canis), hookworms (Ancylostoma caninum), whipworms (Trichuris vulpis), and Taenia tapeworms (not the common flea tapeworm).
- Effectiveness: Kills 95–100% of adult worms present at the time of treatment; it does not affect migrating larvae, which is why repeat dosing at set intervals matters for puppies.
5-Day Protocol (Giardia and Resistant Cases)
- Targets: Giardia duodenalis, chronic parasite-driven diarrhea, and some resistant whipworm strains.
- Why longer: Giardia is a protozoan, not a worm, and its cysts are more resistant to fenbendazole than nematode eggs. Studies show 5-day courses achieve roughly 85–95% cyst clearance. Veterinarians sometimes pair this with a course of metronidazole for stubborn or relapsing Giardia cases that don’t fully clear on fenbendazole alone.
7-Day Protocol (Lungworm)
- Targets: Oslerus (Filaroides) osleri lungworm, which lives in the respiratory tract and requires a longer cumulative drug exposure to clear.
- Note: Not every lungworm species responds to fenbendazole some require a different agent entirely, so confirm the specific parasite with your vet before assuming a 7-day Panacur course will work.
What Panacur Does NOT Treat
Panacur does not kill Dipylidium caninum, the flea tapeworm by far the most common tapeworm dog owners actually encounter (the rice-grain segments near the tail). If your dog has fleas and you’re seeing those segments, you need praziquantel, not fenbendazole.
Our praziquantel dosing chart for dogs covers the correct weight-based dose for that specific parasite. Panacur is only effective against the less common Taenia species of tapeworm.
Fenbendazole vs. Other Common Dog Dewormers
| Medication | Target Parasites | Dosing Frequency | Prescription Required |
|---|---|---|---|
| Panacur (Fenbendazole) | Roundworms, hookworms, whipworms, Giardia, some tapeworms, some lungworm | 3–5 consecutive days | No (OTC) |
| Pyrantel Pamoate | Roundworms, hookworms | Single dose, repeat in 2–4 weeks | No (OTC) |
| Praziquantel | Tapeworms (all species, including flea tapeworm) | Single dose | No (OTC) |
| Milbemycin Oxime | Heartworms, roundworms, hookworms, whipworms | Monthly | Yes |
| Metronidazole | Giardia, anaerobic bacteria | 5–7 days | Yes |
How to Give Panacur to Dogs (Without a Fight)
For liquid: Mix the measured dose into 2–3 tablespoons of wet food, plain yogurt, or plain canned pumpkin, or use a syringe placed between the cheek and back teeth (never aimed at the throat) for slow, controlled delivery.
For granules: Sprinkle onto slightly moistened kibble so the powder sticks, or hide it in a high-value treat like plain peanut butter (xylitol-free) or cream cheese. Splitting a large dose between two meals can also improve acceptance.
For paste: Squeeze the calibrated dose directly onto a fingertip for the dog to lick off, or apply directly into food, since the paste is typically flavored to be more palatable than the liquid.
Panacur Dosage Calculator for Dogs by Weight
Panacur 50 milligrams of fenbendazole per kilogram of body weight is the universal dosing rule of the drug in dogs when used once per day. To individuals who are pound workers, this is around 22.7mg/ pound.
However, this is where most pet parents get disoriented: Panacur is available at different concentrations, and the 50 mg /kg is the amount of the active (fenbendazole) not the amount of volume of liquid or paste you are squeezing out.
Calculator of Panacur Liquid (10% Suspension) Dosage
Panacur liquid includes 100mg of fenbendazole per milliliter (10 percent concentration). This is the most prevalent formulation where correct dosing is required particularly in the small dogs.
Formula:
Dog’s weight in kg × 0.5 = mL of Panacur liquid to administer daily
Example: A 10 kg dog needs 10 × 0.5 = 5 mL once daily
Calculator Panacur 22.2% Granules/Powder Dosage.
Granular formulation has 222mg/g of fenbendazole. One gram of scoop of the product contains about 222mg of active ingredient (One is contained in the package).
Formula:
Dog’s weight in kg × 0.225 = grams of Panacur granules to administer daily
Example: A 20 kg dog needs 20 × 0.225 = 4.5 grams daily
Safe-Guard Paste (100 mg/g) Dosage Calculator
Safe-Guard paste which is used most frequently on dogs that refuse to take the liquid or the granules, and it has 100 mg of fenbendazole per gram.
The notches on the plunger give a certain amount of dosage depending on the body weight- but always check the weight chart on the package.
What Happens If You Give Too Much? (Overdose)
There is no established lethal dose or specific overdose syndrome for fenbendazole in dogs. Accidentally doubling a dose or slightly overestimating weight is very unlikely to cause serious harm the most common result is mild, self-limiting vomiting or diarrhea.
That said, deliberately exceeding label directions is never advisable, and any dog showing severe or prolonged symptoms after any medication should be seen by a vet.
Safety, Side Effects, and Contraindications
Is Panacur Safe?
Yes—exceptionally so. The LD50 (lethal dose to 50 per cent animals) has never been determined in dogs, as they merely do not become toxic to fenbendazole.
In research studies, doses of 500 mg/kg (10 times the therapeutic dose) in the long-term did not have any significant adverse effect.
Possible Side Effects
Most dogs do tolerate Panacur, however, there are those who are likely to have:
- Mild vomiting (generally, one hour after taking the dosage)
- MUC Soft stool or diarrhea (usually cures with treatment)
- Salivation (more frequent with liquid formulation) increased.
- Anorexia (an absence of appetite)
These effects are normally self-limiting and do not need to be discontinued. In case of severe vomiting especially further than 24 hours after the vomiting, visit your veterinarian.
Contraindications (Rare) True
- Hypersensitivity known: This type of allergy to fenbendazole is extremely uncommon yet than can happen (facial swelling, hives, difficulty breathing).
- Liver have severe hepatic impairment The liver clears fenbendazole; end-stage liver disease of dogs may necessitate a dose adjustment.
Pregnancy and Puppies
Panacur has received the FDA approval to be used in pregnant dogs and puppies that are at age 6 weeks. It is often applied by many breeders prior to weaning in an attempt to minimize vertical infections of the puppies by roundworms. The teratogenic effects are absent.
FAQs
Will I overdose my dog when using Panacur?
Although fenbendazole has a large safety margin, it is always advisable to use the recommended Panacur dosage calculator of dogs depending on the actual weight. Toxicity is very unlikely, and overdosing can result in temporary vomiting or diarrhea. In one of them, dogs were dosed 500mg/kg/day in 10 days -10 times the usual dose- and there was mild, reversible digestive disturbance only.
Is Panacur the drug that I need a prescription?
Fenbendazole is available over-the-counter in the United States, without prescription, in the form of fenbendazole products (such as Panacur, Safe-Guard) and also in form of the generic fidibendazole. Nevertheless, we highly suggest that diagnosis to be done by a veterinarian precedes the treatment. The various parasites will need different protocols and some worms (such as Dipylidium tapeworms) will not react to Panacur.
Before long before I can see worms in the stool of my dog?
The dead worms are normally seen 24 to 72 hours upon the first dose. Hookworms and roundworms resemble spaghetti strands and threads, respectively. When treating Giardia, the presence of organisms cannot be observed, the ability to improve the consistency of stools will be the indicator of success.
Is it possible to use the dosage calculator of Panacur with puppies?
Yes, but there is one condition; Puppies must be 6 weeks of age. The dose remains 50 mg/kg. Even young pups with ages not exceeding 6 weeks might have poor detoxification channels but still, fenbendazole is deemed to be rather safe even in neonates.
What if I miss a day?
Missing a dose should be taken as soon as possible followed by a day-to-day schedule. When you are about to take the next dose, omit the one that you missed- do not take twice. The course can be either 3 days or 5 days but one day of break is not a disaster.
Panacur: Pregnant drug safe in dogs?
Yes. Panacur is branded to be used in dog breeding such as the pregnant bitches. Various veterinarians suggest deworming pregnant dogs to minimize chances of the pup being exposed to the roundworms by the placenta or milk.
Why does not my dog improve and stop to have diarrhea after Panacur?
Provided that your dog was treated with Giardia and then you continue to have symptoms after 5-7days, you should: 1) take into account reinfection of a dog with contaminated environment, 2) combined parasites not addressed with fenbendazole, 3) non-parasitic diarrhea causes (dietary indiscretion, IBD, etc.). Follow up with your vet.
Is it safe to use horse paste Panacur with my dog?
Horse paste concentrations differ and dosing errors are frequent although the active ingredient is the same. Do not use any other product labeled canine but stick to our canine-specific dose-calculation of Panacur depending on the weight of the animal with veterinary advice in large animals.
Final Thoughts:
The only as good as the information you feed into a panacur dosage calculator of dog is. The three implementations of effective deworming include accurate weight measurement and correct formulation identification and proper diagnosis.
Although the safety profile of Panacur is more than encouraging, drugs should never be treated lightly and even a so-called gentle drug, such as fenbendazole, is supposed to be respected and accurately used.
There is nothing so beautiful as Panacur, with its simplicity, one dosage, one-a-day schedule, and extraordinary success in dealing with the efflagrants that afflict our dog friends most of all.
Be it a breeder trying to treat a kennel, a pet owner trying to treat a newfound rescue or a person having an obstinate case of Giardia, this drug has proved itself worthy of a spot in almost every veterinarians prescription portfolio.
Always place your weight on the dog then divide by a dose. The most frequent source of dosing errors is the guessing of weight. A small dog kitchen scale or a large dog veterinary clinic scale will give the accuracy that the calculations are worthy of.
And when in doubt? Call your vet. Five minutes of phone consultation will save weeks of useless treatment.
