Dog Dewormer Guide: Types, Dosage and Safe Deworming

Intestinal worms are common in dogs, especially puppies. They can cause discomfort and illness, and some can spread to people. A dog dewormer works only when it is the right product, at the right dose, for the right worm. This guide explains how it works. It is general information and not a substitute for a vet's advice.

Common worms in dogs

Roundworms: very common in puppies, and can look like spaghetti in vomit or stool
Hookworms: can cause anemia and weakness
Whipworms: often cause chronic diarrhea and are hard to spot
Tapeworms: usually spread by fleas, with rice-like segments near the tail
Heartworm: a different problem, spread by mosquitoes and prevented with a separate medication

Signs your dog may have worms

Diarrhea, sometimes with blood or mucus
Vomiting
Weight loss or a pot-bellied look
A dull coat
Scooting
Worms or segments visible in stool or around the tail

Some dogs show no signs at all, which is why routine testing matters.

Types of dewormers

Different active ingredients treat different worms. Common ones include pyrantel, fenbendazole, praziquantel and milbemycin, and many monthly heartworm preventives also control some intestinal worms. No single product covers every worm, which is why it matters to choose with your vet.

How dosing works

Dewormers are dosed by your dog's weight, and products vary widely in strength and form, including tablets, chewables, liquids and pastes. Dosing is not interchangeable between products, between dogs and cats, or between dogs and livestock. Do not guess the dose or use a product made for another species. Ask a vet to confirm the product and the exact dose for your dog's current weight.

Puppy deworming

Puppies are often treated several times in their first weeks of life, because they can be infected before birth or through milk. Vets typically follow a schedule, then move to regular preventive treatment. Your vet will set the plan.

Deworm safely

Get a fecal test to find out which worms are present
Use a product recommended by your vet for your dog's weight and age
Follow the schedule and finish the course
Control fleas, which spread tapeworms
Clean up stool promptly and wash your hands afterward
Retest if symptoms continue

When to call a vet

Call a vet if your puppy is very young, if there is vomiting, blood in the stool, a swollen belly, or your dog seems weak. Dogs with other health conditions should not be treated without advice.

Have questions about your dog's dewormer or dosage? Talk to a licensed vet on Waggle Vet. For stool testing, find a vet near me.

FAQs

Can I use over-the-counter dewormer?

Some are available, but they only treat certain worms. A vet can help you choose.

Can humans catch worms from dogs?

Some can spread to people, which is why hygiene matters.

How often should I deworm my dog?

It depends on age, lifestyle and prevention. Ask your vet.

Check current Waggle Vet access and eligibility terms. Chat with a vet.

Service limits and further guidance

Waggle Vet currently provides live chat guidance, not a promised live video or phone consultation. Access, response times and species support depend on current availability and eligibility. Do not assume medication can be prescribed: state licensure, a valid VCPR, veterinary judgment and federal requirements apply. An in-person examination may be needed.

AVMA: telehealth and the veterinarian-client-patient relationship

Sources checked October 14, 2026. These references do not constitute veterinary review or endorsement of this article.