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Why is my senior chihuahua vomiting after heart meds and antibiotics?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Male | neutered | 10 years and 10 months old | 11 lbs

My 11 year old chihuahua Bayzel has been recently diagnosed with heart failure. He started with a bad cough but after some days on Vetmedin and lasix he had made a huge improvment until today. When I got home I noticed he threw up some chicken he was also drinking alot of water. After he was done drinking I gave him his meds ( including amoxicillin, due to his teeth) but after the meds he thew up nothing but water. Is this bad? Note: the chicken I served with his meds was a couple days old

1 Answer

Most Helpful Answer

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Answered By Destini R. Holloway, DVM

Veterinarian

Published on June 28th, 2017

Poor Bayzel. Vomiting while on antibiotics could be an adverse effect of the medication, especially if he was just started on it less than 24 hrs ago. Notify your vet and another antibiotic can be tried. If he wasn't just started on the medication, then yes the chicken could have upset his stomach, especially if he isn't used to it and/or it had spices on it that just didn't agree with him. Offer him fresh, plain boiled chicken breast and white rice for the next few feedings and also some Pedialyte (non-flavored) diluted 50:50 with water to help keep him hydrated after so many bouts of vomiting. If he is still vomiting up water and food by tomorrow, then its best to take him to your vet for further care. These don't sound like signs that are related to his heart disease at the moment. Bloodwork analysis may help reveal the underlying problem. I hope that Bayzel feels better soon and best wishes moving forward with his care.

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