Petco Text Logo
Petco Pet Logo

  • Two Easy Ways to Start Earning Rewards!

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

Image profile

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.

Vote icon

1Pet Parents found this answer helpful

Related Answers from Veterinarians

  • Image profile

    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!

    Vote icon

    1Pet Parents found this answer helpful

See More Answers

Related Questions

Petco Pet Education Center
Health & Wellbeing
My 3 month old mix breed shihtzu was dewormed 15 hours ago and it seems that she is too weak now. She can't barely walk. After being dewormed, she only got a few dose of food (force feed). Please help me. It's my first time to have a puppy and it's m
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.
Updated on September 24th, 2025
Petco Pet Education Center
Health & Wellbeing
I bought a 45 day german shephard female puppy yesterday. She has not eaten anything except for she had cerelac once. We gave her deworming medicine yesterday evening. Since, then she has been inactive and sleeping. She also puked twice and had one l
Poor baby. I'd take to her in for evaluation by a vet tonight (an emergency room) if she's not eating or drinking at all and won't play. Young dogs can get low blood sugar or dehydration rather quickly. There are many possible issues here ranging from her being stressed by travel and a new home, to intestinal parasites, to serious infections like parvo virus, to having something stuck in her intestines. At the vet clinic, she'll most likely be tested for parvo, and receive some fluids and treatment for her vomiting and diarrhea. Good luck to you and sweet Angel!
Updated on September 24th, 2025
Petco Pet Education Center
Health & Wellbeing
My 6 week old puppy. Has round and hook worms. I had her de wormed on monday. She is drinking fine now but still wont eat and very week. Is there any way to get ber to eat?
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 24th, 2025
Petco Pet Education Center
Health & Wellbeing
My dog is AsPin (Asong Pinoy) Its not high breed or what but Im worried. She vomits frequently since last night, I think for about 8 times now. The first night he vomits, it was all the food she ate that night. But today she vomit a worm and tonight
Ideally, she should be examined by your veterinarian to diagnose the specific parasite and to provide supportive care (IV or subcutaneous fluids, anti emetics, etc.). Protracted vomiting can quickly lead to dehydration in a young puppy. If she is not yet vaccinated, she may be developing a serious viral infection. In this situation, an exam is strongly recommended over home care. If this is not possible, withhold food for 12 hours. Allow small amounts of water or an unflavored electrolyte replacement beverage. Resume feeding a bland diet (1:1 ratio of plain boiled boneless/skinless chicken and plain white rice). Feed in small, frequent amounts waiting at least one hour between feedings. If the vomiting stops, transition slowly to the regular diet. If not, definitely see your veterinarian or take her to the nearest veterinary ER.
Updated on September 24th, 2025
Petco Pet Education Center
Health & Wellbeing
I got a new puppy who had never been wormed. I don't have the money for another two weeks to take her to the vet. We went to buy her shots and wormer. Her shots went fine and she acted normal so 4 days later I gave her her wormer. Now 2 days later sh
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 24th, 2025
Petco Pet Education Center
Health & Wellbeing
Hello just wanted to know what we should and could do if we just had to deworm all four of our puppies. Monday we bought them the chewables to get rid of round worms all of them was fine than playing and very active all the way up until this morning
I'm concerned about Miss Lady. I'm worried that there is something else going on with her, like a GI illness. If it was caused by the deworming treatment, you would have seen symptoms around Monday. Given that she is vomiting, won't eat or drink, and won't play, she should see a vet immediately.
Updated on September 24th, 2025
Petco Pet Education Center
Health & Wellbeing
I dewormed my litter of puppies after one of them passed just very near recently she had worms. Well one of them is starting to show the same problems as the one who passed. After deworming she's vomiting diarrhea weight loss and loss of appetite.
Hi,t hanks for using Boop by Petco! 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 24th, 2025
Petco Pet Education Center
Health & Wellbeing
Puppy threw up his dewormer a few minutes after it was administered. They are not eating, having a hard time keeping even water down, and diahrrea constantly, occasional small amounts of blood in stool. One threw up a (round?) worm earlier. Are medi
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 24th, 2025
Petco Pet Education Center
Health & Wellbeing
my puppy (5 months) is not eating anything from pas 3 days...today i saw that there were worms in my puppy's poop...moreover if she eats something she vomits after some time...some doctors say we should not give her deworming medicines if she is not
Oh my. I am so sorry your puppy is so ill. IF Brownie has not been fully vaccinated, I would first be suspicious of a viral infection (i.e. parvovirus) as the cause for her illness. Have her tested through your vet right away, because she will need extensive treatment if that is the case. If she is fully vaccinated, then my next suspicion would be a foreign body obstruction. She will need to visit your vet and have abdominal radiographs taken to look for signs of an obstruction and then treated accordingly, which typically involves surgical removal of the foreign body. Best case scenario is that she has a really bad case of gastritis (inflammation of the stomach) caused by something she ate. If that is the case, you will still need to see your vet b/c she need anti-nausea medication, fluid therapy if she is dehydrated, and antibiotics to clear things up, as well as the dewormer. You can absolutely give a pet dewormer if they are not eating; however, you want to make sure the pet
Updated on September 24th, 2025
Petco Pet Education Center
Health & Wellbeing
My dog just vomited for 2 times with worm in it then I already dewormed my puppy but she still won't still eat and only drunk a water.
Hi there and thanks for posting on Boop by Petco! Puppies need to be dewormed with a broad spectrum dewormer such as pyrantel several times (3-4 times with each dose being 2 weeks apart from each other) as many puppies are born with roundworms they get from their mother's during pregnancy. It can take a few rounds of dewormer to get rid of them. If Roxy is vomiting up worms, then she likely has a very heavy intestinal worm infection. Sometimes this can cause nausea and inappetence as well. Occasionally, if the worm density is high, they can cause a gastrointestinal obstruction. I would withhold food for a few hours from Roxy to help with the vomiting and take her into see her veterinarian as soon as possible to rule out an obstruction or vomiting/inappetence from other medical cause such as a viral infection. Your veterinarian may recommend Roxy be dewormed a few more times and may send you home with more dewormer for her if nothing more serious is suspected from your vet. I hope
Updated on September 24th, 2025
image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Book Now

Sponsored