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Puppy lethargic, wobbly, not eating after roundworm meds. Normal?

Updated On September 23rd, 2025

Pet's info: Dog | Australian Shepherd | Male | unneutered | 19 lbs

My 15 week old puppy was diagnosed with roundworms. We gave him the meds our vet prescribed him and now he's very lethargic and is very wobbly and uninterested in his food. Is this normal? I'm just really worried about him.

1 Answer

Most Helpful Answer

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Answered By Lauren Jones VMD

Veterinarian

Published on March 24th, 2017

Poor Kai! I'm sorry to hear that he isn't feeling well and I understand your concern! In some puppies with a significant burden of roundworms, vomiting and diarrhea can occur as a means of expelling the worms. This also can cause inappetence from nausea and mild lethargy as a result. Although rare, intussusception (essentially intestines that telescope into one another) can occur in cases of parasitism, which can cause vomiting, lethargy and inappetence. At this point, monitor Kai for changes tonight and try to tempt him to eat with boiled white meat chicken and white rice as a bland diet. If he is still lethargic and not eating by the morning, he should be examined by his vet. The greatest likelihood is simply that his body is working to expel the roundworms.

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