"There are small long white worms in my cat's stool, what is that?" Worms are one of the most common pet health problems but also one of the most often underestimated. Many owners only notice after seeing worms in the stool or vomit, yet by that stage, the infestation is already heavy.
This article explains the types of worms common in cats and dogs in Indonesia, the signs of worms that are often missed, the deworming schedule from kitten/puppy to adult, the drug options available, and why animal worms are also a risk for young children in the home.
Why worms should be taken seriously
Worms in the digestive tract (or the heart, for heartworm) absorb nutrients, damage the intestinal wall, and if present in large numbers can trigger:
- Weight loss despite eating normally
- A swollen belly (especially in kittens and puppies)
- Anemia from hookworms that suck blood
- Intestinal obstruction in massive infestations in small animals
- Reduced immunity → susceptibility to other diseases
- Zoonosis, some animal worms can transmit to humans, especially young children
The key thing to understand: an animal can have worms without any worms being visible in the stool. Seeing worms externally = already an advanced stage. A routine deworming schedule = prevention, not a reaction after seeing worms.
Types of worms common in cats and dogs in Indonesia
Four main groups of worms are relevant in Indonesia's tropical climate:
1. Roundworm, Toxocara
- Toxocara cati in cats, Toxocara canis in dogs
- Long like noodles (spaghetti), white-cream in color, 5-15 cm
- Live in the small intestine, absorbing nutrients from digested food
- Transmission via stool, the mother's milk (transmammary), or the placenta (transplacental in dogs), this is why kittens and puppies are almost certainly born with roundworms
- Adult cats/dogs are partially immune but can still be infected and become a source of eggs in the environment
- This is the worm most often seen by owners in the stool or vomit
2. Tapeworm, Dipylidium and Taenia
- Dipylidium caninum, the most common in cats and dogs in Indonesia. Transmission via the bite of a flea carrying tapeworm larvae (the flea = vector)
- Flat, segmented like "rice grains", detached segments come out with the stool or stick to the fur around the anus
- Characteristic sign: the animal drags its bottom across the floor (scooting) because the worm segments move out of the anus
- Strong link with fleas, if an animal has Dipylidium tapeworm, there is almost certainly fleas present now or in the past. Treating tapeworm without eradicating fleas = it comes back. (Details in the sibling article about fleas and ticks.)
3. Hookworm, Ancylostoma
- Ancylostoma caninum (dogs) and Ancylostoma tubaeforme (cats)
- Small worms 1-2 cm with "teeth" that attach to the intestinal wall and suck blood
- Transmission via stool (eggs hatch in moist soil) or via skin (larvae penetrate the foot pad/abdominal skin in contact with soil)
- Main danger: anemia, hookworms voraciously suck blood. In puppies/kittens a heavy infestation can cause pale gums, weakness, even death
- Endemic in tropical climates like Indonesia, especially moist soil + yards with dog/cat feces
4. Heartworm, Dirofilaria immitis
- Not an intestinal worm, it lives in the right heart and pulmonary arteries
- Transmission via the bite of a mosquito carrying larvae
- Tropical Indonesia = mosquitoes year-round = high heartworm risk, especially in outdoor dogs
- Chronic symptoms: cough, exercise intolerance, weakness, shortness of breath. In cats it is more often asymptomatic or appears as asthma-like symptoms
- Diagnosis requires a special blood test (not visible on fecal examination). Active heartworm treatment is very expensive and risky → monthly prevention is far cheaper and safer
Signs of worms in an animal
Some signs are often missed by owners, especially in the early stage:
- Worms visible in stool or vomit, the most obvious, but already an advanced stage
- Small white segments around the anus, like "rice grains", characteristic of tapeworm
- Scooting (dragging the bottom on the floor), anal irritation from tapeworm or anal gland impaction
- Swollen belly in kittens/puppies, a "pot belly" despite a thin body, characteristic of heavy Toxocara
- Weight loss, despite eating normally or more
- Dull, non-shiny coat, nutritional deficiency caused by worms
- Diarrhea, sometimes with blood, especially hookworm
- Pale gums, anemia from hookworm
- Persistent cough + exercise intolerance (dogs), suspicious of heartworm
- Weakness, reduced appetite, non-specific but can be a sign of heavy worm infestation
Because many signs are non-specific and mild worm infestations are often asymptomatic, a routine deworming schedule is more reliable than waiting for symptoms.
The recommended deworming schedule
Based on ESCCAP (European Scientific Counsel Companion Animal Parasites) and CAPC (Companion Animal Parasite Council) guidelines, the standard deworming schedule:
Kittens and puppies (birth – 6 months)
- Age 2-3 weeks, first deworming
- Every 2-3 weeks until 12 weeks of age (routine dewormer)
- Monthly from 12 weeks to 6 months
- After 6 months, enter the adult schedule
The reason for the dense schedule in kittens/puppies: almost all are born already carrying roundworms from the mother (transmammary/transplacental), and dewormers generally do not kill larvae still migrating, only adult worms in the intestine. So it needs to be repeated as the larvae mature.
Adult animals (>6 months)
- Every 3 months (4× a year), the standard for most house cats and dogs
- Every month, for high-risk animals: frequently outdoors, contact with other cats/dogs, young children in the home, a worm outbreak in the area
- Monthly heartworm prevention year-round for dogs in Indonesia (tropical climate = mosquitoes year-round)
Pregnant and nursing animals
- Pregnant dams, deworming around 1-2 weeks before birth (using a product safe for pregnancy, at the veterinarian's dose)
- Nursing dams, dewormed together with their offspring to break the transmission cycle via milk
Common dewormer options in Indonesia
For cats and dogs, broad-spectrum (intestinal worms)
- Drontal, pyrantel pamoate + febantel + praziquantel (dog version) or pyrantel + praziquantel (cat version). Full spectrum: roundworm + hookworm + tapeworm. Oral tablet. The cat and dog versions differ, do not mix them up.
- Drontal Plus, for dogs, with added febantel effective against whipworm
- Pyrantel pamoate (Pirantin, Combantrin-1), effective for roundworm and hookworm. Does not kill tapeworm. Safe for young kittens and puppies.
- Praziquantel, the gold standard for tapeworm. Often combined with pyrantel or ivermectin in all-in-one products.
- Profender, emodepside + praziquantel, a spot-on formulation (drops on the scruff) for cats. Practical for cats that are hard to give oral tablets. Effective against roundworm, hookworm, tapeworm.
For heartworm
- Heartgard / Heartgard Plus, ivermectin (Heartgard) or ivermectin + pyrantel (Heartgard Plus). Monthly chewable tablet for dogs. Prevents heartworm + bonus roundworm and hookworm (Plus version).
- Revolution / Stronghold, selamectin spot-on. Prevents heartworm + fleas + ear mites + some intestinal worms. Cat and dog versions available.
- Milbemax, milbemycin oxime + praziquantel. Oral tablet for cats and dogs, combines heartworm prevention + intestinal worms + tapeworm in one tablet.
The choice depends on lifestyle, ease of administration (tablet vs spot-on), and budget. Cats that are hard to give tablets are usually better suited to Profender. An outdoor dog in a high-mosquito area → monthly Heartgard Plus is an ideal combination.
Consult a veterinarian before combining many products, some combinations can overlap (e.g. Heartgard + Drontal both contain pyrantel) or interact (Bravecto + Milbemax dose may need adjusting).
How to give dewormers effectively
- Calculate the dose based on actual body weight, not a guess. Underdosing = not all worms die, overdosing = risk of side effects
- Give when the stomach is not too empty to reduce nausea, unless the label instructs otherwise
- Make sure it is swallowed, with tablets, note that cats sometimes spit them back out. You can use a pill pocket, pill gun, or roll it into wet food
- Spot-on (Profender), applied to the scruff where the animal cannot lick it. Avoid bathing 48 hours before and after
- Repeat per the schedule, one dose ≠ worm-free forever. A routine schedule is the key
- Clean up stool promptly, especially after deworming, the stool can contain many dead worms that are infective (eggs not yet released) → dispose of it and wash your hands
Zoonosis: animal worms to humans (especially young children)
This section is often not emphasized, yet it is important for families with young children.
Some animal worms can transmit to humans:
- Toxocariasis, Toxocara eggs from animal stool ingested by humans (especially young children who play in the soil, then put their hands in their mouths). The larvae migrate in the human body → can trigger visceral larva migrans (internal organ damage) or ocular larva migrans (eye damage, even blindness)
- Cutaneous larva migrans, hookworm larvae penetrating human skin (especially those who walk barefoot on sand/soil where animals defecate). Causes a winding, itchy rash on the skin
- Dipylidium, tapeworm can transmit to a young child who accidentally swallows an infective flea (cats/dogs that have recently shed fleas are often the source)
The highest risk is in children aged 1-7 years because of their behavior: playing in soil/grass, frequently putting hands in their mouths, close contact with animals without washing hands. Most human toxocariasis cases are subclinical, but severe ones can be serious.
Easy prevention:
- Routine deworming per the schedule, a worm-free animal = no infective eggs in the environment
- Clean up animal stool promptly from the yard and litter box
- Wash children's hands after playing with animals or in the soil
- Do not let toddlers have intimate contact (kissing the face, licking) with an animal that has not been dewormed
- Wear footwear in the yard/sand where the animal usually defecates
For families with infants/toddlers or pregnant women, veterinarians usually recommend a stricter deworming schedule for the animal (monthly, not 3-monthly).
Cat and dog worm FAQ
My animal doesn't look sick, does it still need deworming?
Yes. Mild-to-moderate worm infestations are often asymptomatic, owners only notice after worms become visible in the stool, and by then it is an advanced stage. Plus, for zoonosis prevention for family members, routine deworming (once every 3 months for adults) is still recommended even if the animal looks healthy.
Can human dewormers be used for animals?
Some active ingredients are the same (e.g. pyrantel pamoate is in human Combantrin and in animal dewormers), but the dose and formulation differ. The risk of wrong dosing is high. Some human dewormers also contain ingredients toxic to animals. Use products with a clear animal label + documented body-weight dosing.
I see worms in the stool, should I go straight to the vet or can I buy medicine myself?
For a healthy adult animal with visible worms (round or tape), buying a broad-spectrum dewormer (Drontal for the right species + body-weight dose) is usually enough, then repeat 2 weeks later. But consulting a veterinarian is mandatory if: the animal is a kitten/puppy/elderly/sick, there are other symptoms (bloody diarrhea, swollen belly, weakness), or you are unsure of the worm type. For heartworm, DO NOT try to treat it yourself, it requires a blood test first and treatment must be under veterinary supervision.
Can I combine flea medication with dewormer on the same day?
Generally yes, and many modern products are indeed designed as combinations (Revolution = fleas + worms, Profender = cat spot-on dewormer, Heartgard Plus = heartworm + intestinal worms). But if using separate products, read each label, some combinations (e.g. high ivermectin + spinosad) require spacing. Consult a veterinarian for a safe schedule.
How long after deworming do you see results?
Adult worms usually die within 24 hours after the drug is given, then pass out with the stool over the next 1-3 days. You may see whole worms or fragments in the stool, that is normal and a sign the medicine is working. If after 3-5 days worms are still coming out continuously = possibly a heavy infestation, needing a repeat dose or a switch to a broader-spectrum product. Consult a veterinarian.
Summary
Worms are a common parasite problem but often missed because many cases are asymptomatic. The four main worm groups relevant in Indonesia: roundworm (Toxocara), tapeworm (Dipylidium, linked to fleas), hookworm (Ancylostoma, danger of anemia), and heartworm (Dirofilaria, a risk in mosquito areas).
The standard deworming schedule: kittens/puppies every 2-3 weeks until 12 weeks, then monthly until 6 months; adults every 3 months (or monthly for high-risk animals and homes with young children); monthly heartworm prevention for dogs year-round in tropical Indonesia.
Drug options range from the practical (Profender spot-on for cats, Heartgard chewable for dogs) to all-in-one combinations (Milbemax, Revolution). Choose according to the animal's lifestyle and your veterinarian's advice.
Want to consult about the right deworming schedule for your animal, or need deworming done at home? Contact us on WhatsApp, mention the species, age, weight, last deworming history, and whether there are young children at home. The Prabasa Vet team will help set up a suitable schedule.
Read also: Fleas and Ticks in Pets: Safe Treatment, Drug Options, and Prevention, First Cat Vaccination for New Owners, Complete Pet Care Guide.
Medical references used in this article
This article was prepared with reference to the following sources, verified sentence by sentence for clinical content:
- ESCCAP Guideline 01: Worm Control in Dogs and Cats, deworming schedule for kitten/puppy/adult, transmammary/transplacental transmission, risk factors
- Companion Animal Parasite Council (CAPC), Recommendations on Deworming Schedule + Hookworm/Roundworm zoonosis (visceral & ocular larva migrans, cutaneous larva migrans)
- Plumb's Veterinary Drug Handbook 7e, monograph for praziquantel, pyrantel pamoate, milbemycin oxime, emodepside (Profender), ivermectin (Heartgard): species doses, indications, contraindications
- CAPC General Recommendations, heartworm prevention in endemic areas (tropical, mosquito year-round)
This article is general guidance based on the international ESCCAP and CAPC guidelines. For product selection + specific dose according to body weight, medical condition, and your household composition, consulting a veterinarian is the right step.
