Intestinal Worms in Australian Dogs and Cats: The Complete Guide to Prevention, Treatment and Protecting Your Family

When most pet owners think about worms, they imagine seeing spaghetti-like parasites in their dog's stool or rice-like segments around a cat's tail.

The reality is often quite different.

Many dogs and cats carrying intestinal worms appear perfectly healthy. Some continue shedding parasite eggs into the environment for months without their owners noticing any obvious signs.

As a veterinarian with more than 15 years of experience, I still diagnose intestinal worm infections every year in pets whose owners were convinced there was no possible way their animal could have worms.

The good news is that intestinal worms are largely preventable.

Understanding how pets become infected, what symptoms to watch for, and how often preventative treatments should be given can dramatically reduce your pet's risk.

What Are Intestinal Worms?

Intestinal worms are parasites that live within the digestive tract of animals.

They survive by feeding on nutrients, blood or intestinal contents from their host.

Depending on the species involved, worms may:

• Compete for nutrients

• Cause blood loss

• Damage the intestinal lining

• Trigger inflammation

• Reduce growth and development

• Spread disease to humans

Australia's most commonly encountered intestinal parasites include:

• Roundworms

• Hookworms

• Tapeworms

• Whipworms

Each species has its own unique lifecycle and method of transmission.

Roundworms: The Most Common Worm in Puppies and Kittens

Roundworms are among the most frequently diagnosed intestinal parasites in young pets.

Adult worms resemble strands of spaghetti and can grow surprisingly large within the intestine.

How Roundworms Spread

Puppies commonly acquire roundworms before birth while still developing in the uterus.

Both puppies and kittens may also become infected through their mother's milk.

Pets can additionally become infected through:

• Contaminated soil

• Hunting rodents

• Eating infected prey

• Contact with contaminated environments

Symptoms of Roundworms

Signs may include:

• Pot belly

• Vomiting

• Diarrhoea

• Weight loss

• Poor growth

• Visible worms in stool

Heavy infestations can be dangerous, particularly in young animals.

Hookworms: Small Worms, Big Problems

Hookworms are significantly smaller than roundworms but can be more dangerous.

These parasites attach to the intestinal wall and feed directly on blood.

How Pets Become Infected

Hookworm larvae can infect pets through:

• Contaminated soil

• Contact with infected faeces

• Nursing from infected mothers

• Penetrating the skin

Symptoms

Common signs include:

• Pale gums

• Weakness

• Anaemia

• Bloody diarrhoea

• Weight loss

Young puppies can become critically ill if significant blood loss occurs.

Tapeworms

Unlike roundworms and hookworms, tapeworms require an intermediate host to complete their lifecycle.

Several different tapeworm species can affect Australian dogs and cats, and understanding the source of infection can help owners reduce their pet's risk.

Flea Tapeworm (Dipylidium caninum)

This is the most common tapeworm seen in suburban dogs and cats.

Pets become infected when they accidentally swallow an infected flea during grooming.

Signs of Infection

Many pets show no obvious symptoms, but owners may notice:

• Rice-like segments around the anus

• Segments on bedding

• Excessive licking of the rear end

• Scooting

Because fleas are required for transmission, effective flea control is an important part of preventing reinfection.

Taenia Tapeworms

Taenia species are typically acquired when dogs or cats eat infected prey animals or consume raw meat containing larval cysts.

Pets that hunt rodents, rabbits, lizards or are fed raw diets may have an increased risk of infection.

Most infections cause few clinical signs, although tapeworm segments may occasionally be visible in the faeces.

Hydatid Tapeworm (Echinococcus)

Hydatid disease is of particular concern because it can affect both animals and humans.

Dogs become infected by consuming infected offal from livestock or wildlife species carrying hydatid cysts.

Humans can become accidental hosts by ingesting eggs shed in dog faeces, potentially leading to cyst formation in organs such as the liver or lungs.

Fortunately, hydatid disease is uncommon in urban Brisbane pets but remains an important consideration for:

• Rural dogs

• Hunting dogs

• Working dogs

• Dogs fed raw offal

Whipworms: The Hidden Parasite

Whipworms primarily affect dogs.

Unlike some parasites that shed eggs regularly, whipworms can be frustrating to diagnose because egg shedding may be intermittent.

Signs of Whipworms

• Chronic diarrhoea

• Blood in stool

• Weight loss

• Straining to defecate

Whipworm eggs can survive in the environment for years, making prevention particularly important.

Can Indoor Pets Get Worms?

Absolutely.

This is one of the most common misconceptions I encounter.

Indoor pets may become infected through:

• Fleas entering the home

• Shoes carrying contaminated soil

• Potting mix

• Insects

• Geckos and lizards

• Raw meat diets

• Hunting behaviour

Indoor-only does not mean parasite-free.

Can Humans Catch Worms From Pets?

Yes.

Several intestinal parasites are considered zoonotic, meaning they can infect people.

Children are generally considered the highest-risk group because of their increased exposure to soil and tendency to place hands near their mouths.

Human Health Risks

Potential consequences include:

• Skin irritation from hookworm larvae

• Gastrointestinal disease

• Organ migration by roundworm larvae

• Rare eye infections

While serious human infections are uncommon, regular parasite prevention substantially reduces risk.

Why Puppies and Kittens Need More Frequent Worming

Young animals are particularly vulnerable because many are born with worm infections or acquire them shortly after birth.

Their immature immune systems allow parasites to establish more easily.

Recommended Puppy Worming Schedule

• Every 2 weeks from 2 weeks of age

• Continue every 2 weeks until 12 weeks

• Monthly until 6 months

• Every 3 months thereafter

Recommended Kitten Worming Schedule

• Every 2 weeks from 2 weeks of age

• Continue every 2 weeks until 12 weeks

• Monthly until 6 months

• Every 3 months thereafter

Following these schedules helps minimise environmental contamination and supports healthy growth.

How Often Should Adult Pets Be Wormed?

For most Australian pets:

Dogs

Every 3 months for intestinal worm prevention.

Cats

Every 3 months for intestinal worm prevention.

Certain lifestyles may warrant additional parasite prevention depending on hunting habits, travel history and environmental exposure.

What Happens If Worms Are Left Untreated?

Untreated worm burdens can lead to:

• Chronic gastrointestinal disease

• Nutritional deficiencies

• Weight loss

• Anaemia

• Poor growth

• Reduced quality of life

In severe cases, particularly in puppies and kittens, worm infestations can become life threatening.

Should You Perform Faecal Testing?

Faecal testing can help identify parasite infections and is particularly useful when investigating:

• Chronic diarrhoea

• Weight loss

• Gastrointestinal disease

• Newly adopted pets

• Raw-fed animals

However, a negative faecal test does not necessarily guarantee a pet is parasite free.

Many parasites shed eggs intermittently.

This is why routine prevention remains the cornerstone of parasite control.

Dr Nic's Expert Advice

If there is one message I would like every Australian pet owner to remember, it is this:

Most pets with worms do not look sick.

Waiting until symptoms appear often means the infection has been present for weeks or months.

Routine parasite prevention remains one of the safest, simplest and most cost-effective healthcare decisions owners can make.

A regular worming schedule protects your pet, reduces environmental contamination, and lowers the risk of zoonotic disease affecting your family.

Some products combine intestinal worming with monthly protection against other parasites such as heartworm, fleas and ticks but as of 2026, there is no product that does all 4 types of intestinal worms, heartworm, fleas and ticks. 

Where Can Brisbane Pet Owners Get Advice About Worming?

If you're located in Brisbane and have questions about parasite prevention, flea control, intestinal worming or heartworm protection, the veterinary teams at Fortitude Valley Vet and South Brisbane Vet can help.

Common reasons owners seek advice include:

• Choosing the right worming product

• Worming puppies and kittens

• Raw-fed pets

• Hunting dogs and outdoor cats

• Pets with recurring parasite infections

• Multi-pet households

Frequently Asked Questions

How often should I worm my dog in Australia?

Most adult dogs should receive intestinal worm prevention every three months.

How often should I worm my cat?

Most adult cats should receive intestinal worm prevention every three months.

Can indoor cats get worms?

Yes. Indoor cats can acquire worms through fleas, insects, prey animals and contaminated materials entering the home.

Can humans catch worms from dogs and cats?

Certain worm species can infect humans, making routine prevention important.

Are worms common in Brisbane?

Yes. Queensland's warm climate supports year-round parasite activity.

Is flea treatment the same as worm treatment?

Not always. Some products cover both parasites, while others only target fleas.

What is the safest way to prevent worms?

Routine preventative treatment recommended by your veterinarian remains the most effective approach.

Final Thoughts

Intestinal worms remain one of the most common yet preventable health issues affecting Australian pets.

Whether your dog spends every weekend at the dog park or your cat never leaves the house, parasite prevention should remain part of their regular healthcare plan.

Preventing worms is easier, safer and less expensive than treating the consequences of a significant infestation.

By maintaining a regular prevention schedule and partnering with your veterinarian, you can help your pet enjoy a healthier and happier life.

Author:

Dr Nic Cher, BVMS - Australia's Trusted Veterinarian

Pet Longevity, Preventative Health and Owner Preparedness Advocate