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How long does it take for my dog to get rid of roundworms?

Finding tiny, spaghetti-like worms in your dog’s poop or seeing them vomit a small worm is enough to make any owner worry—and wonder how quickly you can fix it.

Finding tiny, spaghetti-like worms in your dog’s poop or seeing them vomit a small worm is enough to make any owner worry—and wonder how quickly you can fix it. Roundworms are common, especially in puppies, but the timeline to clear them depends on your dog’s age, the medication you use, and sticking to vet guidelines. Plus, many places require regular deworming to comply with local pet health laws, so getting this right matters beyond just your dog’s comfort.

Most dogs start feeling better within 24 to 48 hours of their first dewormer dose, but full roundworm removal takes 2 to 4 weeks. Vets usually prescribe oral meds (like pyrantel pamoate) that kill adult worms first—those will pass in your dog’s stool within a day or two. But eggs often linger in their system, so a follow-up dose 2 to 3 weeks later is key to wiping out any newly hatched larvae. For example, a 10-week-old puppy might need two rounds of meds, while an adult dog with a mild case could be clear in 2 weeks.

Cleaning your home is just as important as the medication to stop reinfection. Vacuum carpets daily, wash your dog’s bed in hot water (60°C or higher—this kills eggs), and wipe down floors with a pet-safe disinfectant. In areas like Germany or parts of Canada, failing to control parasites can lead to fines, since roundworms can spread to humans (especially kids). Always wash your hands after handling your dog or cleaning their space to stay safe.

Puppies need extra care because they often get roundworms from their mom. Many breeders start deworming at 2 weeks old, with follow-up doses every 2 weeks until they’re 8 weeks old. This early dog roundworm treatment keeps the parasites from stunting their growth. If you adopt a puppy, ask for their deworming records—vets will want to see these to avoid doubling up on meds, which could harm your pup.

Watch for signs the worms are clearing up: less vomiting, normal energy levels, and no more worms in their stool. If your dog still seems lethargic or you spot worms after 4 weeks, call your vet—they might need a different medication or to check for other issues. Never use over-the-counter dewormers without vet approval; some are too strong for small breeds or don’t target roundworms specifically.

By following your vet’s dose schedule, deep-cleaning your home, and keeping up with regular deworming, your dog will be free of roundworms in no time. Staying on top of this not only keeps your pup healthy but also keeps you compliant with local pet health regulations. Remember, prevention is key too—monthly heartworm meds often include roundworm protection, making it easy to avoid future infestations.

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