Deworming Dogs and Cats: How Often Is Needed?

Deworming your dog or cat is one of the simplest health routines you can set up, yet many pet owners aren't sure exactly how often it should be done. Regular deworming protects not only your pet from intestinal worms, but the whole family too, since some parasites can be transmitted to humans. Here's a practical guide to help you find the right rhythm based on your pet's age and lifestyle.

Why regular deworming matters for dogs and cats

Intestinal worms (round or flat) settle in an animal's digestive system and feed at its expense. Even a mild infestation can weaken the body, slow down growth in young animals, and further weaken older or already sick pets. Regular internal deworming helps to:

• Eliminate parasites already present before they multiply
• Preserve the animal's overall condition, coat quality and appetite
• Reduce the risk of transmission to other pets in the household
• Limit the risk of transmission to humans, especially children who tend to have closer contact with animals

How often to deworm a dog or cat

Puppies and kittens

Young animals are especially vulnerable, as they can become infected right from birth or through their mother's milk. They usually need to be dewormed more frequently than adults, following a tight schedule during the first months of life, then gradually spacing out treatments as they grow.

Adult dogs and cats

For a healthy adult dog or cat, deworming several times a year is generally recommended, with the exact rhythm depending on the animal's lifestyle (see below) and best confirmed with a professional.

Pregnant or nursing females

A female intended for breeding should be dewormed at key moments around whelping or queening, in order to limit parasite transmission to her offspring. This should always be done under veterinary supervision.

Lifestyle affects how often you should deworm

Not all animals face the same risk of parasite exposure. Several factors increase the recommended frequency:

• Outdoor access: a dog or cat that goes outside regularly, hunts, or interacts with other animals is more exposed
• Fleas: certain fleas can transmit a type of tapeworm, which makes good external parasite control all the more important alongside deworming
• Raw diet or hunting: eating prey or uncontrolled meat increases the risk of ingesting parasites
• Group living: an animal frequently in contact with others (boarding, breeding, shelters) is more exposed
• Children or vulnerable people in the household: in this case, a tighter deworming schedule is often recommended as a precaution

An indoor-only animal with no outdoor contact may need less frequent deworming, but should never skip it altogether.

Recognizing the signs of a worm infestation

Certain symptoms should raise concern and prompt a quick visit to the vet:

• Swollen or bloated belly, especially in young animals
• Weight loss despite a normal or even increased appetite
• Dull coat, lack of energy
• Diarrhea, vomiting or digestive irregularities
• Visible worm segments or worms in the stool or around the anus
• Irritation or excessive licking of the anal area ("scooting")

These signs aren't always present: many animals carrying worms show no visible symptoms at all, which makes regular preventive deworming even more important.

How to properly administer a dewormer

1. Choose a form suited to your pet: tablet, paste, spot-on or liquid solution
2. Follow the correct dosage based on your pet's weight, since it directly determines the dose
3. Set a regular reminder (calendar, app) so you don't miss the next treatment
4. Watch your pet closely in the hours after administration for any unusual reaction
5. Combine internal deworming with good flea and tick control, as the two often go hand in hand

The exact protocol (product, dose, frequency) should always be established with a veterinarian, who will tailor recommendations to your pet's age, weight, health status and lifestyle. For dogs, you can consult veterinarians specialized in dogs; for cats, turn to veterinarians specialized in cats to set up a tailored deworming schedule.

How often should you really deworm an adult dog or cat?

In general, several times a year is a common baseline for an adult pet, but the exact frequency depends on its lifestyle, exposure to external parasites and environment. Only a veterinarian can establish the schedule best suited to your pet.

Need a professional opinion? If in doubt or in an emergency, find a veterinarian near you on TunisieVet.