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My puppy is weak, vomiting, not eating after deworming. What to do?

Updated on September 23rd, 2025

Pet's info: Dog | American Bulldog | Female | unspayed | 2 months and 9 days old | 10 lbs

We have a 9 week old American bull dog that we got last Saturday and i took her to get her shots and heart worm medication and they gave her worm medication on Wednesday then the next day she is weak and won't really eat and keeps throwing up

2 Answers

Most Helpful Answer

Answered By Lauren Barry, BVSc, MRCVS, DVM

Veterinarian

Published on June 10th, 2017

Hi, I'm worried if Zoey is still weak and vomiting. Young pups don't have much in reserve so if they stop eating they can deteriorate very quickly. It could be related to the de worming medicine if she had a lot of worms that died quickly, or she may have an illness like parvo, giardia or coccdia. If she's not eaten today, take her to the emergency vet tonight. If she's eaten some and is still walking about, take her in the morning.

1Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By Dr. Melanie, BVSc MS
Veterinarian
Published on August 6th, 2017
Oh no, poor Zoey! She is experiencing a reaction to the Roundup, as eating grass that is still wet with it causes vomiting. You can also see diarrhea, excessive drooling, and weight loss. If she has vomited multiple times, then yes I would take her into a vet. She will need IV fluids to prevent dehydration, and the vet can treat her symptoms. If she has only vomited once, I would keep an eye on her for now. Withhold food for 12-24 hours, then feed a bland diet of boiled white meat chicken (no bones) and white rice in small amounts several times a day for a couple of days. Then slowly add back in her normal diet. I hope this helps and Zoey feels better soon!
1Pet Parents found this answer helpful

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Puppy weak, not eating, can't walk after deworming. What's wrong?

Thank you for submitting your question regarding Maze. I recommend that she sees her veterinarian right away. This is a dramatic response to a dose of deworming medication. If she had a very large parasite load, the dewormer could make her ill as the worms die off. However, most puppies are not as sick as you have described. She could also have another disease that presented at the same time. Regardless, she needs veterinary care. I worry that her blood sugar has dropped low as she is not eating well. This can make a puppy weak and wobbly. I hoep this information helps and you get her feeling better soon.

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My 6-week puppy is weak and won't eat after deworming. Help!

Lelia not eating is a sign that she feels very bad and it's possible that it is related to a reaction from that dewormer although other causes are possible. The big concern is that she is very young and not eating. Puppies do not have the physical reserves of an adult dog. If she has not been eating since Monday then you need to take her in for an exam and medications to soothe her stomach. You don't want her to end up with low blood sugar and need a visit to the emergency clinic! If she will not eat her own puppy food, try warmed white meat chicken and plain white rice. This is not balanced but it will be fine for a few days. If she will not eat that, she is pretty sick. With young puppies, it's best to be cautious as they are fragile. Have her checked out today if possible.

Updated on September 23rd, 2025

My puppy threw up and won't eat after wormer. Is this normal?

I am not sure the type of dewormer or the vaccines that you used but vomiting often, lethargy, and not eating are not typical 2-4 days after vaccination and deworming. It is very concerning that she is having these signs and she could have an infection or possibly have a parasite that was not susceptible to the dewormer that you used. She really should be seen by a vet to determine the cause and treat. She may need an anti-vomiting injection, antibiotic, antacid, gastrointestinal protectant, dewormer, and/or other medications to treat. You could try to find a clinic that would work out a payment plan or apply for care credit and have her seen. Hope she feels better soon!

Updated on September 23rd, 2025

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Is my puppy sick after deworming? Medicine or serious illness?

Hi,t hanks for using Petco Pet Education Center, formerly Petcoach! Dewowmers have the potential to cause an upset stomach such as vomit, diarrhea and decreased appetite. Though I am worried something else is going on since you lost a puppy recently. I worry most about parvo virus in puppies this age, especially if they are yet to be vaccinated. I would have this puppy seen today by your Vet and tested for parvo virus as it is VERY contagious and if it is the cause it will likely affect the entire litter. If it isn't parvo the Vet can at least get this puppy feeling better and prevent dehydration. Good luck!

Updated on September 23rd, 2025

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Puppy threw up dewormer, sick, vomiting, diarrhea. What should I do?

Poor pups. While a heavy parasite load can cause severe GI upset, and anemia which can cause a pup to become extremely lethargic, have bloody diarrhea, etc, I would also want to rule out underlying illnesses as a possibility. It would be best to bring them to a vet ASAP especially if they are lethargic or unable to keep any food or water down as puppies can quickly become very dehydrated. They may also need supportive care such as an IV or injected medications if they are very ill from the parasites or other causes. You can try continuing to offer water, or rubbing a little honey on their gums for energy until you can get to the vet, however due to the severity of symptoms it would be best to seek emergency care.

Updated on September 23rd, 2025

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My 2-week-old puppy is weak and slow after deworming. Is this normal?

I can’t think of a way that this would be related to the most common broad spectrum dewormers that we use but it would help to know what kind exactly. She may have low blood sugar or an infection. It sounds like she was moving better before today, but if not some puppies have abnormal leg muscle formation and it might be something like this (swimmer puppy). If she hasn’t been eating well, if you’ve seen vomiting or if she seems disoriented you should rub some honey on her gums and see if you can find an emergency vet somewhere. Otherwise head to a vet in the morning.

Updated on September 23rd, 2025

Why is my unvaccinated puppy vomiting and skinny after deworming?

I would be worried about parvo with those symptoms or a bacterial infection. If it is parvo, he was exposed and incubating the virus before the vaccine so it was not protective. The best thing to do is feed boiled chicken and rice and try to keep him hydrated with pedialyte or Gatorade. I would try to find an ER clinic or a vet that takes after hours calls to get him seen today for a test and further treatment

Updated on September 23rd, 2025

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