Puppy Deworming: Schedule and Types of Parasites
Complete guide to puppy deworming: recommended schedule, differences between internal and external parasites and how to choose the right antiparasitic.
Deworming is one of the pillars of puppy health and one of the aspects that most confuses new owners. How often should you deworm? What is the difference between internal and external parasites? Are antiparasitics safe for such a young puppy? This article answers these questions with a clear guide based on current veterinary recommendations.
Internal Deworming: The Parasites You Cannot See
Intestinal parasites are extremely common in puppies. In fact, most are born already infected with Toxocara canis (roundworm), as larvae cross the placenta and are also transmitted through breast milk. Other common parasites in puppies include hookworms, tapeworms (transmitted by fleas), Giardia, and coccidia.
Internal Deworming Schedule
European veterinary guidelines (ESCCAP) recommend:
- From 2 weeks of age (done by breeder or shelter): every 2 weeks until weaning.
- From weaning to 3 months: every 2 weeks.
- 3 to 6 months: monthly.
- From 6 months on: at minimum every 3 months (4 times per year), or more frequently if there are children in the home or the dog has outdoor access.
External Parasite Control: Fleas, Ticks and More
Ectoparasites are not just a nuisance — they can transmit serious diseases like ehrlichiosis, babesiosis, Lyme disease (ticks) or heartworm (mosquitoes). In Spain, protection against ectoparasites is especially important in spring and summer, but in Mediterranean areas parasitic pressure is almost permanent.
External Antiparasitics: Which to Choose
- Spot-on pipettes: applied to the skin at the nape. Last around 4 weeks.
- Antiparasitic collars: long-lasting protection (up to 8 months in some products).
- Oral tablets: convenient and fast-acting. Some combine flea, tick and internal parasite protection in one monthly tablet.
- Sprays: useful as a supplement, especially in very young puppies where other forms are contraindicated.
Warning: antiparasitic products for dogs containing permethrin are extremely toxic to cats. Always inform your vet if you live with cats.
Warning Signs: When to See the Vet
Consult a vet if the puppy shows persistent diarrhea, a distended abdomen, visible parasites in feces, intense itching, localized hair loss, or pale mucous membranes in a young puppy.
