Petco Text Logo
Petco Pet Logo
  • Two Easy Ways to Start Earning Rewards!

    rewards header
    Become a member today!
    Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
    Petco Pay LogoBecome a credit card member today!

    Earn 2X Pals Rewards points at Petco
    when you use Petco Pay!

    APPLY NOW
    Learn More About Petco Pay Benefits

My dog is vomiting and has diarrhea after deworming. Is this normal?

Updated on September 23rd, 2025

Pet's info: Dog | Yorkshire Terrier | Female | unspayed | 1 year and 10 months old | 3.4 lbs

My dog was given deworming medication this pst Saturday. She was given Pyrantel endoparasite and revolution ectoparasite. Her stools were normal on Sunday. On Monday she didn’t poo at all. And all day Tuesday she was throwing up and pooing diarrhea. She would poo sometimes very dark brown and sometimes orange with a couple blood spots and little white things. I don’t know if this is normal. She seems to not feel sick she’s still hungry and drinks water but I’m very concerned!!!!

2 Answers

Most Helpful Answer

Justin Plunk, DVM

Answered By Justin Plunk, DVM

Veterinarian

Published on June 20th, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach!

I am sorry to hear Hazel is vomiting and having diarrhea. Her condition is not normal, and I would recommend following-up with your veterinarian this morning as soon as they open for a reassessment appointment. She may need some labs ran to ensure nothing major is wrong internally which is something for you to discuss with your vet. At a minimum, it is likely she will need anti-nausea medication as well as some medications to help with the diarrhea. If left untreated, she could become very dehydrated which would make her extremely sick. It is much better to get on top of these things before they become a bigger problem.

I hope this helps and that Hazel's condition resolves quickly!
Vote Icon1Pet Parents found this answer helpful

Related Answers from Veterinarians

  • Answered By Lindsey Edwards MVB, BSc, IVCA

    Veterinarian

    Diarrhea following deworming treat me is not uncommon, especially if worms were present. As long as her appetite is good and there is no persistent vomiting i would not be overly concerned. A probiotic such as fortiflora with added fiber can be helpful for recovery

    Vote Icon

    0Pet Parents found this answer helpful

Smart Picks for Smart Questions

Have A Vet Question?

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

Share

Styled arrow button