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Dog not eating, vomiting, and lazy after deworming. What's happening?

Updated On September 23rd, 2025

Pet's info: Dog | Labradoodle | Male | unneutered | 1 year and 7 months old

after deworming bruno did not eat his meal the next day . and even vomitted. he ate only once and that was very little dry food. today again he is not eating anythinh and behaving very lazy. I can hear sounds from his stomach. i tried to feed him but he is not eating. what is happening ?

4 Answers

Most Helpful Answer

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Answered By Stacey Anstaett, DVM

Veterinarian

Published on January 25th, 2019

I am sorry to hear that Bruno isn't feeling well. Sometimes after they are dewormed, they feel a little punky because if they have a large load of intestinal worms that die all at once, those worms can release inflammatory components that upset the GI tract. If he still isn't back to himself, take him to your vet. He may have another cause go gastroenteritis, or he may have eaten something he shouldn't have (such as a toy, etc) and may have an intestinal blockage. I hope he's feeling better now! I am sorry for the delay in our answering of your question. Thank you for asking Petco Pet Education Center, formerly Petcoach!

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Other Answers

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    Answered By Linda G, MS, DVM

    Veterinarian

    Published on February 1st, 2019

    Hello. As long as Brownie is still drinking water & not vomiting, there is no need to panic. The worms & wormer may have upset his stomach. For now, I would pick up some jarred pureed meat baby food ( like turkey ) that does not have onions or garlic in it. Try feeding him about a teaspoon every hour or so. I would also try rubbing some light karo syrup on his gums at the same time to keep his sugar levels up. If he refuses to eat , or continues to vomit over the next 24 hours, you will have to find a veterinarian to help sort things out for you & Brownie. I hope Brownie is feeling better soon & thanks for using Petco Pet Education Center, formerly Petcoach.

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    Answered By Ann Dion, DVM

    Veterinarian

    Published on June 9th, 2019

    Hello and welcome to Petco Pet Education Center, formerly Petcoach. The image you have provided looks like there are roundworms present. If there is a very large worm burden (large numbers of worms), this can cause animals to not be able to eat, and have vomiting and diarrhea. You need to get him a dewormer that covers for 'roundworms'. I also recommend getting him to a vet as soon as you can, as medication to stop the vomiting is a good idea. Best of luck with Bolt! I hope he feels better soon!

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    Answered By Lauren Jones VMD

    Veterinarian

    Published on June 18th, 2017

    I'm sorry to hear that Cosmo isn't feeling well. I always say, better out than in when it comes to intestinal worms! I would not be surprised if more worms are passed either in his stool or vomit after the dewormer. It is possible that these intestinal worms are the reason that he has been vomiting and lethargic, but he could also be experiencing stomach upset from a virus (including parvovirus if he has not been fully vaccinated), stomach upset from different foods or treats, or a foreign body intestinal obstruction. Remember that young puppies are more susceptible to the effects of dehydration and hypoglycemia than adult dogs. Since Cosmo is still refusing food and lethargic, I recommend taking him to a vet urgently for evaluation. He will likely need some diagnostic testing, including abdominal x-rays to try to rule out suspicions of an intestinal foreign body obstruction. I hope this helps and that he feels better soon!

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