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My 12lb dog took 500mg amoxicillin. Is this an overdose? Will he be okay?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 3 years and 10 months old | 12 lbs

My 12lb dog took a 500mg amoxicillin last night. He was definitely feeling ill, poor guy... will he be ok? And can we continue like normal to treat his UTI or should we skip a dose?

2 Answers

Most Helpful Answer

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Answered By Joy Fuhrman, DVM, MBA, CPA

Veterinarian

Published on May 26th, 2018

Hopefully Chappo will only experience GI effects for this overdose. However, in some cases Amoxicillin overdose can cause neurological side effects, elevated liver enzymes and even cardiac issues. Do not give Chappo any more amoxicillin until you are able to get him in to your veterinarian.

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    Answered By Andrea M. Brodie, DVM

    Veterinarian

    Published on

    500g amoxicillin is a way too high dose for your 12 lb dog. You will need to take Chappo to a vet for an exam and a urinalysis to verify that he has a UTI (rare in male dogs). Please do not give medications to your dog without a diagnosis and prescription by a veterinarian.

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