Deworming in Finland is no longer done "just in case" several times a year for every pet. Modern parasite control is risk-based: puppies, kittens and animals that hunt, roam or travel are dewormed on a schedule, while a healthy, low-risk adult is checked with a faecal sample and treated only when needed. The idea is simple — treat at the right time and for the right reason, not by the calendar. Below are the current recommendations, based on the European ESCCAP guidelines and Finnish practice, for cats and dogs of every age, the signs of a worm infection, which product to choose, and the legal tapeworm treatment for travelling dogs.
How often should a cat be dewormed?
For an adult indoor cat, deworming 1–2 times a year is usually enough — and preferably only after a faecal sample shows it is needed. A cat that goes outdoors is dewormed about 4 times a year, and a cat that actively hunts mice and other rodents monthly, because rodents transmit tapeworms. The more your cat hunts, the more often it needs treatment; a strictly indoor cat with a clean faecal sample may not need any.
When is a kitten dewormed for the first time?
Kittens get their first deworming at 3 weeks of age, and it is repeated every 2 weeks until 2 weeks after weaning, then — for kittens with ongoing risk, such as outdoor access — monthly until 6 months of age, otherwise by faecal sample. The mother is treated at the same time as the litter. Kittens are treated so early and so often because roundworm larvae pass to them through the milk, and a heavy worm burden stunts a kitten's growth — a pot belly, dull coat, diarrhoea and poor weight gain are typical. A kitten you have just adopted should be dewormed on the same schedule if its history is unknown, ideally 1–2 weeks before its first vaccination.
Does an indoor cat need deworming?
Less often than an outdoor cat, but not never. Indoor cats can pick up roundworm eggs carried in on shoes or fur, from soil in potted plants or from raw meat, and a cat that catches an occasional mouse in the house can get tapeworms. The sensible approach for an indoor cat is a faecal sample once a year and deworming only if parasites are found — or a routine treatment 1–2 times a year if you prefer not to test. Kittens are dewormed on the kitten schedule regardless of lifestyle.
How do I know if my cat or dog has worms?
Often you don't — many infected adults show nothing, which is why the faecal sample matters. Signs to watch for are a swollen belly (especially in kittens and puppies), weight loss despite a good appetite, diarrhoea or vomiting, a dull coat, dragging the bottom along the floor, and rice-grain-like tapeworm segments around the anus or in the bedding. Roundworms are sometimes seen in vomit or faeces as pale spaghetti-like strands. If you see any of these, bring a faecal sample to the clinic — we examine it the same day.
How often should a dog be dewormed?
How often depends on the dog's lifestyle. A dog that is mostly indoors and has little contact with other dogs is dewormed 1–2 times a year — or checked with a faecal sample at the same frequency and treated only if needed. A typical family dog that meets other dogs in parks and on walks should be treated, or have a faecal sample examined, about 4 times a year. Hunting dogs, dogs that roam freely, dogs that eat prey, carcasses or faeces, and dogs that travel are treated 4–12 times a year, and during the hunting season a monthly tapeworm treatment is justified. Dogs fed raw meat that has not been frozen or thoroughly heated should also get a monthly tapeworm treatment.
When is a puppy dewormed for the first time?
Puppies are dewormed for the first time at 2 weeks of age, because roundworm larvae pass to them already in the womb and through the milk. Treatment is repeated every 2 weeks until 2 weeks after weaning and then — for puppies with ongoing risk, such as puppy classes and dog parks — monthly until 6 months of age; the dam is treated together with the litter. Ask the breeder for the puppy's deworming record when you collect it and continue the schedule your vet recommends — typically monthly until six months for a puppy that meets other dogs regularly.
When is a faecal sample enough instead of deworming?
For a healthy adult in the low-risk group — an indoor cat, or a dog that is mostly indoors and has little contact with other dogs — a faecal sample once or twice a year is enough: if it is clean, no medication is needed. Dogs and cats with more exposure (park walks and dog contact, outdoor access) are tested at the same frequency at which they would otherwise be treated, about 4 times a year. Collect a small amount of fresh faeces (from three consecutive days, mixed in one container) and bring it to the clinic; we examine it under the microscope for worm eggs and Giardia. Treating only when parasites are found avoids needless medication and slows the development of drug resistance — not yet a proven problem in Europe, but already seen in hookworms in the USA and Australia.
Which intestinal worms are common in Finland?
Roundworms (Toxocara) are the most common finding in cats and in puppies and kittens, and they are zoonotic — they can infect people, particularly small children, which is a good reason to deworm young animals properly. Tapeworms occur mainly in animals that eat rodents or raw meat. Giardia is a protozoan that causes diarrhoea and spreads through contaminated water and environment. Hookworms (Uncinaria) are found in Finnish dogs about as often as roundworms, whereas whipworms are rare. The dangerous fox tapeworm Echinococcus multilocularis does not occur in Finland — the import rules for travelling dogs exist precisely to keep it that way — but a related moose tapeworm (E. canadensis) is found in wolves, moose and reindeer in eastern and northern Finland and can infect dogs that eat raw moose or reindeer offal, which is one more reason hunting dogs get regular tapeworm treatment.
Which dewormer should I use — tablet, paste or spot-on?
The right product depends on which parasites you are targeting: praziquantel is needed for tapeworms, while roundworms respond to milbemycin, pyrantel, fenbendazole or emodepside. Combination tablets cover both; spot-on products applied to the neck are convenient for cats that will not take tablets; pastes suit puppies and kittens. In Finland, fenbendazole, flubendazole and pyrantel products, and praziquantel on its own or combined with pyrantel (such as Drontal tablets or the Dronspot spot-on), are sold at pharmacies without prescription, whereas milbemycin (Milbemax), emodepside (Profender) and the combined flea-tick-worm spot-ons need a prescription from the vet. The dose is by body weight and the choice by parasite — so ask us which product fits your pet, especially for kittens, puppies, pregnant animals and animals on other medication.
Should I deworm before vaccination?
It is good practice, especially for puppies and kittens: a heavy worm burden may blunt the response to the vaccine and a wormy puppy is not a healthy puppy to vaccinate, and the puppy schedule naturally puts a deworming 1–2 weeks before each vaccination visit. For healthy adults it is not necessary to deworm just because a vaccination is due — bring a faecal sample instead and we check it at the same visit.
What is the legal tapeworm treatment for dogs that travel?
When a dog returns to Finland from abroad, it must by law be treated against the fox tapeworm (Echinococcus) with praziquantel or an equally effective product, given by a vet abroad 1–5 days (24–120 hours) before arrival in Finland and recorded in the pet passport — this applies to Sweden too, including the Vaasa–Umeå ferry. Dogs that travel often within the EU, Norway and Switzerland can use the 28-day rule: two starting treatments given by a vet in Finland 1–28 days apart, then a treatment at intervals of no more than 28 days in any of those countries, with the last dose given in Finland after the trip — every dose must be given by a vet and entered in the passport. No treatment is needed for dogs arriving directly from Norway, Ireland or Malta, and dogs travelling directly from Finland to Norway or Great Britain are exempt there. The full travel requirements are on our EU pet passport page.
We are happy to assess your pet's real need for deworming without unnecessary medication. Book a faecal-sample check or a deworming at Saari Animal Clinic — together we make sure your pet is treated at the right time.
Sources
- ESCCAP: Guideline 01 — Worm Control in Dogs and Cats (European Scientific Counsel Companion Animal Parasites). esccap.org
- Ruokavirasto: Koirien, kissojen ja frettien tuonti EU-maista Suomeen. ruokavirasto.fi
- Ruokavirasto: Usein kysyttyä ekinokokkilääkityksestä. ruokavirasto.fi
- CAPC (Companion Animal Parasite Council): Ascarid (roundworm) guidelines. capcvet.org