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Dog had parvo, now vomiting & diarrhea. Is it parvo again?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 7 months and 13 days old | 40 lbs

hi so, nubs has had parvo in the past and he is acting well now but recently he has been puking & my mom says that’s where he has been playing around the house and got hot. i said ok, cause i know how that is & left it alone. but today he went to the bathroom and it was diarrhea.. do you think he’s getting parvo again?

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3 Answers

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on October 28th, 2018

He should be immune to parvo for at least a year after having had parvo. It is likely a gastrointestinal problem. Diarrhea and throwing up can have many causes such as a problem with the stomach and intestines caused by a food over sensitivity, eating something that does not agree with the dog, intestinal parasites, an intestinal blockage, bacterial infection, viral infection, the weather, food change, stress, etc.  I would fast Nubs for 24 hours and then put the dog on bland food for two days, such as boiled white rice and boiled white boneless chicken meat, fed in small quantities over several feeds and then transition back to regular food slowly over a few days. If this does not clear up the diarrhea or if the vomiting increases, or if your dog gets lethargic, it needs to see a veterinarian for an exam as there may be something more serious such as an infection going on.

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Other Answers

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    Answered By Stacey Anstaett, DVM

    Veterinarian

    Published on June 29th, 2018

    Once he has had parvo, he will not get sick from parvo ever again, so this is something else. Feed him a bland diet (chicken and rice) for the next couple of days and take him to your vet for an exam, possible X-rays and or lab work, and treatment if he’s getting worse or is not improving. Thanks for asking Petco Pet Education Center, formerly Petcoach!

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    Answered By Lauren Kennedy, DVM

    Veterinarian

    Published on August 16th, 2017

    It is very unlikely that your dog has Parvo again. It is almost impossible for them to become sick with it a second time, especially if he is up-to-date on his vaccines. Vomiting and diarrhea together is commonly referred to as gastroenteritis. There can be several causes including pancreatitis, dietary indiscretion, intestinal parasites and a foreign body/blockage. Since Milo has been so sick for over 24 hours I would recommend taking him to the vet to be evaluated. Your vet may recommend blood work and X-rays to figure out what exactly is going on. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.

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