Deworming Dogs & Cats: How Often Is Needed?

Deworming is a routine task that many dog and cat owners tend to overlook. Yet regular deworming protects not only your pet from intestinal parasites invisible to the naked eye, but also your whole family, since certain worms can be transmitted to humans. Whether you have a puppy, a kitten, or an adult animal, understanding the right deworming schedule for dogs and cats is essential to maintaining their digestive and overall health.

Why regular deworming matters

Intestinal worms (round or flat) settle silently in the digestive system of dogs and cats. They feed on the nutrients the animal ingests, which can lead to weight loss, a dull coat, general fatigue, and a weakened immune system, especially in young and elderly animals.

Internal parasite control isn't just about your pet's comfort: some intestinal parasites are zoonotic, meaning they can be passed on to humans, particularly children who have close contact with animals (petting, playing on the floor, being licked). Good hygiene combined with regular deworming greatly reduces this risk.

How often to deworm a puppy or kitten

Young animals are especially exposed to parasites, often passed on from the mother right from birth. That's why the deworming protocol is more frequent during the first months of life:

• An early first deworming treatment, starting within the very first weeks of life, based on veterinary advice.
• Frequent follow-up treatments during weaning and growth, until the immune system strengthens.
• A gradual spacing out of treatments as the animal grows, until reaching the adult schedule.

This stage is crucial: a heavily infested puppy or kitten can show stunted growth, a bloated belly, or persistent digestive issues.

Recommended deworming schedule for adult pets

Once your pet reaches adulthood, the frequency of deworming mainly depends on its lifestyle:

Mostly indoor pets

A cat or dog that lives mainly indoors, with little contact with the outside world, is generally less exposed, but remains vulnerable through fleas (which can carry certain worms) or raw food.

Pets that go outside, hunt, or mix with other animals

A dog that walks outdoors, a cat that hunts rodents or birds, or an animal living in a group setting (kennel, shelter, farm) is more exposed to parasite eggs found in soil, feces, or prey. These animals need more frequent, regular deworming throughout the year.

In all cases, a steady schedule spread evenly across the year is preferable to occasional, irregular treatments, which leave gaps during which the animal remains vulnerable.

Warning signs: how to recognize worms

Certain symptoms should prompt a prompt veterinary visit, even outside the usual deworming schedule:

• Persistent diarrhea or recurring soft stools
• Repeated vomiting
• Bloated belly, especially in puppies and kittens
• Weight loss despite a normal or increased appetite
• Dull coat, lack of energy
• Visible worm segments or small whitish particles in the stool or around the anus
• The animal scoots its rear end along the ground (a possible sign of parasite-related irritation)

These signs aren't always linked to worms, but they warrant an examination to rule out this cause and adjust treatment if needed.

Best practices for effective deworming

• Base the dosage on your pet's actual weight, since underdosing reduces effectiveness.
• Adjust the protocol according to age, health status, and lifestyle, seeking professional advice rather than guessing.
• Combine internal deworming with flea control, since fleas can transmit certain worms.
• Regularly wash food bowls, litter boxes, and bedding areas to limit reinfestation.
• Wash your hands after handling feces or litter, especially before meals.

Since every animal is different, it's best to have a personalized deworming schedule set up with a veterinarian, who will take into account your pet's age, weight, environment, and lifestyle. You can find a professional near you through our veterinarian directory, or consult specialized practitioners directly for dogs and for cats.

Should a newly adopted puppy or kitten be dewormed right away?

Yes: a newly adopted animal, especially one coming from the street or a shelter, should be dewormed soon after arrival, based on veterinary advice. This protects both its health and that of other animals or people in the household. If you're considering adopting a pet, check out our adoption page to best prepare for your new companion's arrival.