Dog deworming: how often, and how not to forget
An adult dog that goes outdoors is dewormed internally at least four times a year — every three months. At higher risk — a hunting dog, a dog on raw meat, or one living with small children — the interval becomes monthly. Puppies start at 2 weeks and are treated every 2 weeks until two weeks after weaning, then monthly until 6 months of age.
- Fleas and ticks are treated separately, per the product’s instructions, through the whole warm season. In Bulgaria ticks carry babesiosis, which runs a severe course.
- A dog spot-on or collar is never used on a cat. Many contain permethrin, which is toxic to cats.
- Most missed doses are not deliberate — three months simply slip by. That is why the reminder is half of the schedule.
How often, by age and risk
The schedule is set by risk, not by calendar. The table is the usual starting point; your vet narrows or widens it for the particular dog.
| Who | Internal | What to keep in mind |
|---|---|---|
| Puppy to weaning | from 2 weeks, every 2 weeks | Puppies are often born already infected — parasites pass from the mother. That is why the schedule starts so early. |
| Puppy to 6 months | once a month | The risk continues after weaning: a puppy sniffs and licks everything. The monthly schedule runs to the sixth month. |
| Adult, goes outdoors | at least 4 times a year | The usual schedule for a city dog. Every three months — any less often and risk grows unnoticed. |
| High risk | once a month | Hunting dogs, dogs on raw food, dogs that catch rodents or live with small children and people with weakened immunity. |
| Pregnant bitch | per a vet’s schedule | Not every product is safe during pregnancy and nursing. No self-dosing here. |
Three different things under one word
"Deworming" covers three separate protections with different products and rhythms. One does not cover the others.
Roundworms and tapeworms
A tablet or paste, every three months for an ordinary city dog. Some of these parasites pass to people too.
- Roundworms — most common in puppies
- Tapeworms — including Echinococcus, dangerous to humans
- Whipworms and hookworms
Fleas and ticks
A spot-on, collar or tablet, through the whole warm season. The interval depends entirely on the product — from a month to several.
- Ticks — carry babesiosis
- Fleas — also carry tapeworm
- A coat check after every walk through grass
Mosquitoes
Heartworm (dirofilariasis) is transmitted by mosquito bites and is widespread in Bulgaria. Prevention is seasonal.
- Heartworm — harder to treat than to prevent
- Prevention through the whole mosquito season
- An annual test before a new season, at the vet’s discretion
Signs your dog has parasites
- Visible worms or white segments in the faeces or around the anus
- Dragging its rear along the floor
- A swollen belly in a puppy, especially after eating
- Weight loss with a normal appetite, vomiting or diarrhoea
- A dull, dry coat and constant scratching
When deworming is compulsory
The law sets no frequency for routine deworming — that is a matter of risk. There are, however, two moments when it is a requirement rather than advice.
- from 6 weeksUnder the Veterinary Medical Activities Act the owner presents the puppy to a vet for a passport, vaccination and deworming.
- for travelFor Ireland, Finland, Malta, Norway and the United Kingdom the dog is treated against Echinococcus by a vet between 24 and 120 hours before entry.
- in the passportWhen a vet carries out the deworming, it is entered in the passport with date and product. Without that entry, the dog is not admitted when travelling.
Travel requirements change more often than the rest. Before leaving, check the current conditions for the country you are travelling to.
A medication course without a missed dose
Antibiotics for ten days, eye drops three times a day, a heart tablet for life — the problem is rarely the medicine itself, but day five, when nobody is sure whether it has already been given. Three things help more than a good memory:
- one personClear who gives the medicine. When "everyone" gives it, most often two people do — or nobody.
- same timeDoses are tied to something that happens anyway — a meal or a walk. Whether the medicine goes with food or on an empty stomach is in the leaflet.
- loggedEach dose is logged as soon as it is given. The record settles "did I give it" without argument and without a double dose.
- to the endThe course is finished even when the dog looks well. Stopped early, an antibiotic leaves the most resistant bacteria behind.
Common questions about deworming
How often should a dog be dewormed?
An adult dog that goes outdoors — at least four times a year, every three months, against internal parasites. At higher risk — monthly. Fleas and ticks are treated separately, through the whole warm season, at the product’s interval. Puppies follow a denser schedule: every 2 weeks to weaning, then monthly to 6 months.
When is a puppy first dewormed?
At around 2 weeks of age. Puppies are often born already infected, because some parasites pass from the mother before birth and through the milk. That is why the schedule starts so early and runs so densely — every 2 weeks until two weeks after weaning.
Is deworming required by law?
The law requires deworming at the puppy’s first presentation to a vet — from 6 weeks of age, together with the passport and vaccination. There is no legal rule for frequency after that; it is set by risk. It is also compulsory when travelling to Ireland, Finland, Malta, Norway and the United Kingdom — against Echinococcus, by a vet, between 24 and 120 hours before entry.
Can I deworm my dog myself?
Routine internal deworming with a tablet is usually done at home, provided the dose matches the dog’s current weight — so weigh it before every dose. A vet is needed for a puppy under 2 weeks, a pregnant or nursing bitch, a sick dog, and whenever the deworming must be entered in the passport for travel.
Can I use a dog spot-on on a cat?
No. Many dog flea and tick products contain permethrin, which is toxic to cats — even contact with a freshly treated dog can be dangerous. Cats are treated only with products made for cats.
Which app should I use for dog medication reminders?
One where the reminder is tied to the particular pet and the time of the dose, not a generic phone alarm. In PetsClub deworming is its own category in the health file, with type and period, and medication courses are kept as tasks with a date, a time and a note on the dose. Records stay in the history and export as PDF for the vet.
What if I missed a dose?
For routine deworming, give it as soon as you remember and count the next one from the new date. Do not give a double dose to "catch up". For a medication course, follow the leaflet or ask your vet — with some medicines a missed dose is given, with others it is skipped.
The next dose arrives on its own
In PetsClub deworming is its own category in the health file — alongside checkups, vaccines and vitamins. You record the product, the form (tablet, drops or injection) and the period, and the next due date is right where you look for it.
- Deworming as its own category, with type and a from–to period
- Medication courses as tasks — with a date, a time and a note on the dose
- The full history as PDF — for the vet or for travel
