Petco Text Logo
Petco Pet Logo

  • Two Easy Ways to Start Earning Rewards!

New puppy vomiting, diarrhea, unvaccinated. When should I see a vet?

Updated On September 23rd, 2025

I just got a new puppy three days ago (7 weeks old), and last night he started having diarrhea (pudding consistency and yellow), and then later in the night he began to vomit. He is still playful and has an appetite, but I'm unsure if I should bring him immediately to the vet, or do some things on my own, switch up his food, keep him away from other dogs, ect. He has not had his first shots yet.

4 Answers

Most Helpful Answer

Image profile

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on December 6th, 2016

Congrats on your new puppy, but I'm sorry he's so ill! This vomiting and diarrhea could be due to intestinal parasites, GI illness, a new diet, or something more serious such as parvovirus. Given that he is active and still has an appetite, then it is more likely that he is suffering from intestinal parasites or GI upset from a sudden change in diet. I would take him into the vet now with a sample of his feces to see if he does have intestinal parasites so that the vet can prescribe him a deworming treatment. With any young puppy, it's always a good idea to have them checked out when they are vomiting and having diarrhea even if they are active and hungry simply because they are so young and do not have a fully developed immune system. In my opinion, it's best to be safe. Because he has not had his first shots yet, he should be kept away from other dogs (unless you know for certain they are fully vaccinated) and places where strange dogs frequent, like dog parks, until he is fully vaccinated.

Vote icon

1Pet Parents found this answer helpful

Other Answers

  • Image profile

    Answered By Jessica Desrosiers

    Veterinary Technician

    Published on

    As your puppy isn't fully vaccinated and is having both vomiting and diarrhea it is best to take her into the vet as soon as possible. Various causes could be to blame such as parvo (highly contagious and serious), internal parasites, stress, other illness or changes. Having a complete exam is best to check for serious issues and provide treatment.

    Vote icon

    1Pet Parents found this answer helpful

  • Image profile

    Answered By Jennifer Summerfield, DVM CPDT-KA

    Veterinarian, Certified Dog Trainer

    Published on April 12th, 2019

    Hi there. No, vomiting and diarrhea in such a young puppy is concerning, and definitely warrants a vet visit to find out what's wrong. He may have a severe intestinal parasite load, an infectious disease like parvo, or some other illness. I would recommend taking Bubus to the vet today to be seen.

    Vote icon

    1Pet Parents found this answer helpful

  • Image profile

    Answered By Vanessa Yeager DVM MPH

    Veterinarian

    Published on June 16th, 2018

    Hi there and thanks for posting on Petco Pet Education Center, formerly Petcoach! There can be many causes for vomiting and diarrhea- viral or bacterial infections or parasitic infections are most common causes in puppies. I would recommend he see his veterinarian soon for an exam to help determine the cause so he can get appropriately treated. Your veterinarian may want to test his stool, so I would you may want to bring a fresh fecal sample with you to the appointment. I hope this helps!

    Vote icon

    1Pet Parents found this answer helpful

See More Answers

Related Questions

Petco Pet Education Center
Health & Wellbeing
Why is my mouse's eye swollen, cloudy, and has pus?
Is your mouse's eye swollen, cloudy, and pussy? Dr. Melanie, a certified vet, discusses severe eye issues like infection or abscess, urging an immediate visit.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
What fish dog food helps dry skin if my dog eats Science Diet?
Is your dog's dry skin a concern? A certified vet offers expert advice on finding the best fish-based dog food alternatives to Science Diet for essential oils.
Updated on February 04, 2026
Petco Pet Education Center
Food & Nutrition
Can chickens eat bell peppers daily and what about veggie salads?
Can your chickens eat bell peppers and salads? Veterinarian Dr. Elizabeth offers expert advice on safe feeding, frequency, and how fresh veggies boost vibrant yolks.
Updated on December 04, 2025
Petco Pet Education Center
Food & Nutrition
Is Purina Layer Pellets good for chickens? What other feeds exist?
Is Purina Layer Pellets the right choice for your flock? Get expert advice from a Petco veterinarian on Purina and other top chicken feed brands for your chickens.
Updated on December 04, 2025
Petco Pet Education Center
Food & Nutrition
My mice eat all their food together from one bowl. Is this normal?
Do your mice quickly eat together from one bowl? A Licensed Vet Tech explains normal mouse eating behavior and when to watch for aggression. Get expert insights.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My pet is breathing hard, not eating, and lethargic. What's wrong?
Is your rat breathing heavily, won't eat, and has no energy? A Licensed Vet Tech explains potential causes like infection and age, urging a vet visit for diagnosis.
Updated on December 04, 2025
image
Have A Vet Question?

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

Book Now

Sponsored