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My dog won't eat, keeps throwing up after tick and antibiotics.

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 2 years and 3 months old | 43 lbs

2 year old, mix breed and VERY healthy.A month ago she got a tick, it was removed and did not look infected.Friday morning around 7 am my dog threw up.Friday around 1pm she got hives.Took her to the vet, gave her a shot and gave her antibiotics(for the tick, just in case)2 pills everyday with food.Her hives were gone by 3 pm.I was giving her the pills with peanut butter. I noticed she hasn't ate her food.Been 3 days and she hasn't ate her food and has continue to throw everyday. .

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2 Answers

Most Helpful Answer

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Answered By Jenny, DVM

Veterinarian

Published on November 21st, 2017

She needs to be rechecked by your vet. They can do blood work to check for an infection or a tick disease. Some antibiotics can also cause GI upset and no appetite so they will consider that as well. You can try something. BLand such as chicken and rice or broth until you can get her seen

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    Answered By Megan, DVM, CVA

    Veterinarian

    Published on November 21st, 2017

    Poor Bella! She is a beauty! So This could be a sensitivity to the medicine or something else going on. I would try to offer her a small amount of plain Chicken (no bones) and rice to see if she will eat that and keep it down. If she eats and keeps it down then I would give her the antibiotic 30 minutes after eating. If she doesn’t eat or if she vomits then I would not give her the antibiotic and contact your vet for her to be seen again. My concern is that if she is refusing to eat or vomiting every time she does eat that she could have something more serious going on like an intestinal obstruction or foreign body, liver or kidney disease, a toxin ingestion, and much more. Your vet will be able to run some blood work on her and even do some X-rays to see if she needs further treatment or even hospitalization for injectable antibiotics since she is unable to keep the other oral antibiotics down. Your vet will also be able to assess her hydration to ensure she doesn’t need any fluids since she is vomiting so much. I hope this helps and she starts to feel better really soon!

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