Best Time for a Puppy/Kitten’s First Deworming: How Soon After 4 Weeks? Key Safety Guidelines

Many new pet owners wonder when to start deworming their young puppies and kittens. At WERVIC, our veterinary team provides clear, science-backed guidance to ensure safe, effective parasite protection for newborn and young pets.

The optimal age for a puppy or kitten’s first deworming is at 2 weeks of age, with a second treatment at 4 weeks (one month old), and continued doses every 2–4 weeks until 12 weeks of age. This schedule targets parasites transmitted from the mother, including roundworms, hookworms, and tapeworms.

Contrary to common belief, waiting until 2 or 3 months old is too late. Parasites can severely impact growth, cause anemia, diarrhea, vomiting, and malnutrition in young animals.

Key Guidelines for First Deworming

• Deworm at 2, 4, 6, 8 weeks old, then monthly until 6 months
• Use veterinarian-recommended, age-appropriate dewormers
• Strictly follow weight-based dosage; never use adult products on young pets
• Separate internal and external deworming; external treatments usually start at 6–8 weeks
• Monitor for adverse reactions: mild lethargy is normal, but persistent vomiting requires veterinary care
• Maintain hygiene: clean bedding, litter boxes, and living areas to reduce reinfestation

At WERVIC, we emphasize that early, regular deworming is critical for healthy development. With proper timing and safe formulations, pet owners can protect young animals from parasites and support steady growth.