Deworming your dog or cat: what actually matters
Deworming means using medicines to remove intestinal worms — and it matters because these parasites are common, can make young animals seriously ill, and some spread to people. Puppies and kittens need worming early and often; adults need a plan matched to their lifestyle and local risk. There is no single universal schedule or dose, so the right plan comes from your vet.
- Intestinal worms are common, especially in puppies and kittens, and some are zoonotic (can infect people).
- Major veterinary bodies advise starting worming in the first weeks of life and repeating it, then moving to routine broad-spectrum control.
- Frequency for adults depends on age, lifestyle, hunting/scavenging, diet and local risk — which is why guidelines differ.
- This page does not give doses. Ask your vet for a parasite-control plan suited to your pet and your area.
What deworming means
“Deworming” (or worming) is giving a medicine — a dewormer or anthelmintic — that removes intestinal worms from your pet's gut. It is different from heartworm prevention (heartworm is spread by mosquitoes and lodges in the heart and lungs) and from flea and tick control, although some modern products combine several of these. Because no single product covers every parasite and no schedule fits every pet, deworming is best set up as part of a preventive-care plan with your veterinarian.
Common intestinal worms
The worms vets most often deal with in dogs and cats include:
- Roundworms (Toxocara) — very common in puppies and kittens; often passed from the mother before birth or through milk. They can also infect people, which is why control matters.
- Hookworms (Ancylostoma) — attach to the gut lining and can cause anaemia, especially in the young; also zoonotic.
- Whipworms (Trichuris, in dogs) — can cause large-bowel diarrhoea.
- Tapeworms — commonly picked up by swallowing an infected flea, or via prey; segments can look like grains of rice near the tail.
Because up to a large majority of puppies carry roundworms and many infections aren't detected on a single stool test, guidelines recommend treating young animals on schedule rather than waiting for a positive test.
Puppies, kittens and adults
Puppies and kittens: CAPC and AAHA advise beginning deworming for roundworms and hookworms as early as about two weeks of age and repeating it every two weeks until routine, broad-spectrum monthly parasite control begins. Nursing mothers are often treated too. Exact products and timing are set by your vet.
Adult dogs and cats: guidelines such as CAPC recommend year-round broad-spectrum parasite control, while ESCCAP uses a risk-based approach — worming or testing more often for higher-risk pets (hunters, scavengers, raw-fed animals, households with young children or immunocompromised people) and less often for low-risk pets. This is exactly why you'll see different “how often” numbers from different sources: the right frequency is individual.
Signs that may suggest worms, and testing
Some pets show no signs at all. Others may have a dull coat, a pot-bellied appearance (especially puppies), weight loss despite a good appetite, diarrhoea (sometimes with blood or mucus), visible worms or rice-like segments near the tail, or scooting. None of these is proof of worms on its own. A faecal (stool) test helps your vet see what's present, though a single negative test doesn't fully rule worms out — which is another reason young animals are treated on schedule.
Dogs vs cats
Both dogs and cats need worm control, but exposure differs. Dogs that scavenge on walks and cats that hunt or roam pick up parasites more readily, so their plans are often more frequent. Cats that hunt are more likely to acquire tapeworm from prey. As always, use only products labelled for the correct species — never assume a dog product is safe for a cat.
Warm, humid conditions across much of India support year-round parasite activity, and a background parasite burden is common — so routine, vet-guided worming and good faecal hygiene are worthwhile. Heartworm is also present in many regions (spread by mosquitoes) and is prevented differently from intestinal worms, so ask your vet about a combined plan. We don't publish an India-specific schedule here because it depends on your pet and local risk; your veterinarian is the right source.
Good habits — and what to avoid
Do
- Set up a deworming and parasite-prevention plan with your vet, matched to your pet's age and lifestyle.
- Deworm puppies, kittens and nursing mothers on your vet's schedule.
- Pick up faeces promptly from the yard and on walks to reduce environmental contamination.
- Wash hands after handling stool or soil, especially for children — some worms are zoonotic.
- Keep flea control going, since fleas transmit a common tapeworm.
Don't
- Guess a dose from your pet's age or weight, or copy a schedule from the internet.
- Use a dog dewormer for a cat (or vice versa) unless a vet directs it.
- Rely on 'natural' worm remedies of unproven safety or effectiveness.
- Assume one negative stool test means no worms — treat young animals on schedule.
- Feed raw meat or offal, which can carry parasites (guidelines advise cooked or commercial food).
When veterinary advice is especially important
Deworming is a plan, not a one-off — and some situations need prompt veterinary input.
- A puppy or kitten with a pot belly, poor growth, or diarrhoea
- Visible worms, or rice-like segments near the tail or in bedding
- Weight loss, blood in the stool, or ongoing diarrhoea
- Pale gums or weakness (possible anaemia from hookworms)
- A household with young children or immunocompromised people — discuss zoonotic risk
Frequently asked questions
How often should I deworm my dog or cat?
There's no universal answer. Puppies and kittens are wormed every two weeks early in life, then move to routine control. Adult frequency depends on lifestyle and local risk — anywhere from a few times a year to monthly year-round products. Your vet sets the right interval.
Can I just buy a dewormer and give it myself?
Over-the-counter products exist, but choosing the right one and the correct dose depends on species, weight, and which parasites are likely. Getting it wrong can under-treat or harm your pet, so it's best done with veterinary guidance.
Do indoor pets need deworming?
They can still be at risk — worms arrive on shoes, via fleas, or from hunting insects and prey. Indoor pets usually need less frequent control than outdoor ones, but 'never' is rarely the right answer. Ask your vet.
Are dog and cat worms dangerous to people?
Some are. Roundworms and hookworms are zoonotic and are taken seriously, especially for children who play in soil. Routine worming, prompt faeces pick-up and hand-washing greatly reduce the risk.
My pet seems healthy — do they still need it?
Possibly yes. Many infections cause few or no signs, and a single stool test can miss them. Preventive control also reduces environmental contamination and zoonotic risk. Your vet will advise what's appropriate.
Sources
- SourceCompanion Animal Parasite Council (CAPC) — General Guidelines for Dogs and Cats. capcvet.org
- SourceAAHA — Parasite Control (2019 Canine Life Stage Guidelines). aaha.org
- SourceESCCAP — Guideline 01: Worm Control in Dogs and Cats (7th ed., 2025). esccap.org
- SourceUniversity of Wisconsin–Madison Shelter Medicine — Intestinal Parasite Control Guidelines. sheltermedicine.wisc.edu