How often should you deworm dogs?

When your vet mentions deworming at your dog’s checkup, or you spot a stray flea during a post-walk brush—you might find yourself second-guessing how often you really need to act. It’s a common hang-up: too little, and your pup could get sick; too much, and you’re wasting time (and money) on something unnecessary. And with different rules across neighborhoods or even countries, figuring out the right rhythm feels trickier than teaching a puppy to sit.

Most vets agree the frequency of deworming depends on your dog’s age, lifestyle, and local regulations—but there are some general rules to follow. Puppies, for example, need more frequent treatments because their immune systems are still developing; many experts recommend starting at 2 weeks old and repeating every 2 weeks until they’re 12 weeks old. After that, monthly deworming is often suggested until they reach 6 months, as young dogs are more prone to picking up parasites from the environment.

It’s not just about age, though—your dog’s daily habits matter too. If your pup loves exploring wooded areas, rolling in grass, or interacting with other dogs at the park, they’re at higher risk of tapeworms or roundworms. In many European countries and U.S. states, local animal welfare laws actually require regular deworming to prevent the spread of parasites to other pets and even humans. Skipping treatments could lead to fines, not to mention health issues like weight loss or diarrhea for your dog.

Adult dogs typically need deworming every 3 to 6 months, but this can vary based on their risk level. For example, a dog that stays mostly indoors and only goes out for short walks on leashes might need less frequent treatments than a hunting dog that spends hours in fields. Always check with your vet, as they can tailor a plan to your dog’s specific needs and ensure you’re following any regional laws that apply to pet care.

Don’t forget about heartworms, either—they’re a serious threat in many parts of the U.S. and Europe, and prevention is key. While heartworm prevention is often a separate treatment, it’s often bundled with regular deworming meds. Missing a dose can leave your dog vulnerable, and treating heartworm disease is much more expensive and stressful than preventing it. Many vets will remind you that staying on schedule with both deworming and heartworm prevention is part of responsible pet ownership.

Keeping your dog healthy means staying on top of deworming, and it’s easier than you might think. Set reminders on your phone, ask your vet for a schedule that fits your routine, and always keep records of treatments in case local authorities request them. By following these steps, you’ll not only keep your dog happy and healthy but also stay compliant with local laws and do your part to keep the community’s pets safe too.