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My puppy won't eat after dewormer for 2 days, losing weight. Help!

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | unneutered | 5 months and 16 days old | 25 lbs

After giving my dog dewormer medication he will not eat but does keep water down. He hasn't eaten on 2 days and is starting to lose weight. What can I do? I have tried bland diets, changing his food bowl, and even tried to give him treats. He is 5 1/2 months old and I am very worried about him

3 Answers

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on April 6th, 2017

Some dewormers may cause some gastrointestinal upset. It is good that Frankie will drink water and keep it down. Consider mixing in some unflavored PediaLyte. Try a bland diet again but warm it slightly or mix in a teaspoon of baby food to stimulate his appetite. Once he is eating regularly, transition slowly to the regular diet. If he still refuses to eat in the next 24 hours, have him examined by your veterinarian

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8Pet Parents found this answer helpful

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    Answered By David Elbeze, DVM, MRCVS

    Veterinarian

    Published on

    If he hasn't eaten for 2 days, it's highly abnormal, you need to take him to the vet as he might be suffering from a gastrointestinal infection and will need to be treated with medications in order to get better.

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    6Pet Parents found this answer helpful

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on

    I would take Frankie into a vet immediately. It's not a normal reaction for a dog to stop eating for two days after being dewormed and if he's losing weight, he needs veterinary attention now. Please take him into a vet right away.

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    2Pet Parents found this answer helpful

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