Deworm a pit bull puppy at 2, 4, 6, and 8 weeks of age with a pyrantel dewormer, then keep it on a monthly parasite preventive from your vet. That’s the schedule the Companion Animal Parasite Council (CAPC) recommends, because most puppies are born with roundworms or pick them up while nursing. Dose by your puppy’s weight, and have your vet run a stool test to confirm which worms you’re dealing with.
Below you’ll find the full schedule, how to deworm safely, what to expect afterward, and the five over-the-counter dewormers we’d choose for pit bulls and American Bullies. For young puppies, start with Nemex-2. For adult dogs, the Elanco Quad Dewormer covers the most worm types.
Updated September 2026. Dosing and age limits come from each product’s FDA-registered label. This guide is general information, not a substitute for your veterinarian’s advice.
Quick Picks: Best Dewormers for Pit Bulls
| Dewormer | Best for | Treats |
|---|---|---|
| Nemex-2 | Young puppies (from 2 weeks) | Roundworms, hookworms |
| Elanco Quad | Broadest coverage | Roundworms, hookworms, whipworms, tapeworms |
| Durvet Triple Wormer | Adult pit bulls over 25 lb | Roundworms, hookworms, tapeworms |
| Elanco Tapeworm | Tapeworms (often from fleas) | Tapeworms |
| Happy Jack Liqui-Vict 2X | Breeders and whole litters | Roundworms, hookworms |
Puppy Deworming Schedule for Pit Bulls
Roundworms pass from mother to puppies before birth and through milk, so CAPC advises treating every puppy on a fixed schedule, whether or not you see worms.
| Age | What to do |
|---|---|
| 2, 4, 6, and 8 weeks | Deworm with pyrantel pamoate (for example Nemex-2). Treat the nursing mother at the same time. |
| From about 8 weeks | Start a monthly broad-spectrum parasite preventive prescribed by your vet (these usually cover heartworm and intestinal worms). |
| First year | Stool (fecal) test 2 to 4 times. |
| Adult dogs | Year-round parasite prevention, plus a stool test 1 to 2 times a year. |
| New dog of any age | Assume it has worms: deworm and book a stool test. |
Source: CAPC ascarid guidelines. Pyrantel labels such as Nemex-2 suggest an even tighter puppy schedule: 2, 3, 4, 6, 8, and 10 weeks.
How to Deworm a Puppy Safely
- Weigh your puppy. Every dewormer is dosed by weight, and pit bull puppies gain weight fast, so weigh before each dose.
- Match the product to the worm. Pyrantel covers roundworms and hookworms only. Tapeworms need praziquantel, and whipworms need a product that lists them, such as Elanco Quad. A stool test tells you which you’re treating.
- Check the label’s minimum age and weight. Some products start at 2 weeks, others at 4 or 12 weeks.
- Give the full dose. Liquids can go straight into the mouth with a syringe or onto food; make sure the whole dose is swallowed. You don’t need to withhold food.
- Don’t deworm a sick puppy. If your puppy is lethargic, vomiting, or has diarrhea, see your vet first.
- Treat every dog in the home and pick up poop daily so worms don’t cycle back.
The 5 Best Dewormers for Pit Bull Puppies and Dogs
1. Nemex-2 Liquid Dewormer: Best for Young Puppies
Nemex-2 is the pyrantel pamoate suspension many breeders and vets use for the 2-to-8-week puppy schedule. It’s a flavored liquid most puppies take easily, it can be given straight from a syringe or mixed with food, and it’s gentle enough for 2-week-old pups. Owners consistently say it works quickly and is easy to give.
Dose (per label): 1 teaspoon (5 mL) per 10 lb of body weight. A 5 lb puppy gets half a teaspoon (2.5 mL).
Pros
- Safe for puppies from 2 weeks old
- Liquid is easy to dose accurately by weight
- Flavored; most puppies take it willingly
- The 2 oz bottle is enough for a litter’s first rounds
Cons
- Treats roundworms and hookworms only, not tapeworms or whipworms
- Needs a syringe for accurate dosing; mixing into food risks a missed dose
2. Elanco Quad Dewormer Chewable: Best Broad-Spectrum Dewormer
Formerly sold as Bayer Quad, this beef-flavored chewable treats all four common intestinal worms (roundworms, hookworms, whipworms, and tapeworms) in a single dose. That makes it the best all-in-one choice when a stool test finds more than one parasite, or when you’ve just adopted an adult pit bull with an unknown history.
Size note: labeled for dogs over 4 weeks old. The linked pack is for dogs 45 lb and over; Elanco sells smaller weight sizes, so match the pack to your dog’s weight.
Pros
- Covers four worm types, including whipworms
- Single-dose chewable
- Made by Elanco, a major animal-health company
Cons
- Some dogs refuse to eat the chew; you may need to hide it in food
- Some owners report vomiting after the dose
- Sized by weight, so one pack doesn’t fit a growing puppy
3. Durvet Triple Wormer (Medium and Large Dogs): Best for Adult Pit Bulls
Triple Wormer combines pyrantel pamoate with praziquantel, so one chewable handles roundworms, hookworms, and the two common tapeworms. The medium and large version is labeled for dogs over 25 lb and at least 12 weeks old, which fits most adolescent and adult pit bulls. With thousands of owner ratings, it’s one of the most popular routine dewormers you can buy without a prescription.
Pros
- Covers roundworms, hookworms, and tapeworms in one chew
- Sized for pit bulls over 25 lb
- Flavored chewable
Cons
- Does not treat whipworms
- Not for puppies under 12 weeks; the label says safety in breeding and pregnant dogs hasn’t been tested
- Owners are split on whether dogs like the flavor
4. Elanco Tapeworm Dewormer: Best for Tapeworms
If you see small, rice-like segments around your dog’s rear or in its poop, that’s usually tapeworm. Pyrantel won’t touch it. This praziquantel tablet removes the two common dog tapeworms (Dipylidium caninum and Taenia pisiformis). Tablets can be crumbled into food, and it’s labeled for dogs over 4 weeks of age. Because dogs get Dipylidium by swallowing fleas, pair it with flea control or the tapeworms will come back.
Pros
- Targets the two common dog tapeworms
- Can be crumbled into food
- Owners report it’s well tolerated
Cons
- Treats tapeworms only
- Some owners say the bottle holds fewer tablets than they expected; check the count
5. Happy Jack Liqui-Vict 2X: Best for Breeders and Large Litters
Liqui-Vict 2X has the same active ingredient and strength as Nemex-2 (4.54 mg of pyrantel per mL) and the same label dose, but comes in a larger 8 oz bottle. If you’re raising a litter of bully puppies and deworming every two weeks, the bigger bottle makes sense. Treat the mother at the same time, as CAPC recommends.
Pros
- Same pyrantel strength and dose as Nemex-2
- 8 oz bottle covers several rounds for a whole litter
- Comes with a dosing dispenser
Cons
- Roundworms and hookworms only
- Far fewer owner reviews than Nemex-2
- More than a single-puppy home needs
What About Safe-Guard Canine?
Safe-Guard Canine (fenbendazole) is a granule you mix into food for three days in a row. Its label covers puppies from 6 weeks and pregnant dogs, and it’s one of the few over-the-counter options that treats whipworms. Amazon doesn’t sell the dog version, only horse and livestock formulas, which are dosed differently and shouldn’t be given to dogs. Buy the canine version from your vet or a farm supply store.
What to Expect After Deworming
Most dewormers start working within hours. Over the next day or two you may see dead worms in your puppy’s stool. That’s normal, so pick up poop promptly so other dogs don’t get reinfected.
Mild side effects can happen. Product labels list vomiting, loose stools, and lower energy after treatment. Call your vet if vomiting or diarrhea lasts more than a day, if you see a lot of blood in the stool, if your puppy stops eating, or if it seems weak. Heavy worm loads in very young puppies can make them sick, which is one more reason to have a vet check a new litter.
Signs Your Pit Bull Has Worms
Many dogs with worms look perfectly healthy, which is why routine deworming and stool tests matter. When signs do show, they include:
- Worms or rice-like segments in poop or around the rear
- Diarrhea, sometimes with blood or mucus
- Vomiting
- Pot-bellied look in puppies
- Weight loss or poor growth despite eating well
- Dull, dry coat
- Scooting or licking the rear end
- Pale gums and low energy (a sign of anemia from hookworms)
- Coughing (roundworm larvae can pass through the lungs)
Common Worms in Pit Bulls
- Roundworms: the most common worm in puppies, passed from mother to pups. They can also infect people, so wash hands after cleaning up.
- Hookworms: attach to the gut wall and feed on blood; they can cause serious anemia in puppies.
- Whipworms: live in the large intestine and are hard to spot; their eggs survive in soil for years. Pyrantel doesn’t treat them.
- Tapeworms: usually from swallowing fleas or eating rodents; you’ll see rice-like segments.
- Heartworms: spread by mosquitoes and live in the heart and lungs. Over-the-counter dewormers do not prevent or treat heartworm; you need a prescription preventive from your vet.
Long-Term Worm Prevention for Adult Dogs
One round of deworming doesn’t protect your dog for long, and many products kill adult worms but not larvae or eggs. CAPC recommends year-round parasite control for adult dogs, usually a monthly heartworm preventive that also covers intestinal worms, plus a stool test once or twice a year. Keep your yard clear of poop, control fleas, and don’t let your dog eat rodents or wildlife droppings.
How We Chose These Dewormers
We didn’t test these products on our own dogs. We compared dog dewormers sold on Amazon in September 2026 and kept only products that:
- are made for dogs by an established animal-health manufacturer, with the active ingredient and strength on the label;
- have label directions we could check against the product’s FDA-registered label or CAPC guidance;
- have a strong, consistent owner rating across a meaningful number of reviews.
We left out “herbal parasite cleanses,” which aren’t proven to remove worms, and horse or livestock dewormers, which are dosed for much larger animals.
Pit Bull Deworming FAQs
When should I deworm my pit bull puppy?
At 2, 4, 6, and 8 weeks of age with a pyrantel dewormer, then on a monthly preventive from your vet, following CAPC guidelines. Treat the nursing mother at the same time as the litter.
How much Nemex-2 do I give a puppy?
The label dose is 1 teaspoon (5 mL) for every 10 lb of body weight, so a 5 lb puppy gets 2.5 mL. Weigh your puppy before each dose and use a syringe for accuracy.
Can I deworm a pregnant dog?
Some dewormers are labeled for pregnant dogs, including Safe-Guard Canine and pyrantel products like Nemex-2, while others, such as Triple Wormer, say safety in pregnancy hasn’t been tested. Ask your vet before treating a pregnant or breeding dog.
Do over-the-counter dewormers prevent heartworm?
No. Heartworm is spread by mosquitoes and needs a prescription preventive from your vet. Many of those monthly preventives also control intestinal worms.
Our Recommendation
For a new pit bull puppy, follow the 2-4-6-8-week schedule with Nemex-2, then move to a monthly preventive from your vet. For an adult dog, or when a stool test finds several worm types, the Elanco Quad Dewormer covers the most. If you spot tapeworm segments, add the Elanco Tapeworm Dewormer and treat for fleas.
Raising a bully puppy? Read our guides to nutrients American Bully puppies need and American Bully training.