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My dog is lethargic and sad 2 weeks after deworming. What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Female | unspayed

Gave my dog 2 worming tablets 2 weeks ago she is very lethargic she is eating but she isn’t active just sleeping curled up not greeting anyone at the door just looks sad

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2 Answers

Most Helpful Answer

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Answered By Rodrigo Roca, DVM

Veterinarian

Published on April 4th, 2019

Hello, thank you for your question about Sandi. Lethargy is a nonspecific symptom, meaning that it could be a sign of many different underlying conditions. She could have a systemic infection or other condition. I think it is unlikely that her lethargy is related to the deworming tablets, since those were given 2 weeks ago and usually symptoms develop shortly after ingestion. I would recommend having Sandi seen by a veterinarian so that they can perform an examination and discuss the need for additional diagnostics. They may recommend performing bloodwork. Hope this helps, I am sorry that Sandi is not feeling well!

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    Answered By Mara Howard, DVM

    Veterinarian

    Published on December 5th, 2017

    Thanks for using Petco Pet Education Center, formerly Petcoach! I'm sorry to hear Marley has been feeling off. Were the tablets prescribed by a veterinarian or over the counter? Depending on the medications in them, it could be causing GI upset. It could all be secondary to the intestinal parasites, or it could be due to something else entirely (dietary indiscretion, infection, foreign material ingestion, or another underlying issue). As it has been several days, I would recommend having Marley evaluated by a veterinarian to determine if there is something going on that needs to be addressed in order to get him back to his usual self. Good luck!

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