Petco Text Logo
Petco Pet Logo

  • Two Easy Ways to Start Earning Rewards!

My dog has diarrhea & weight loss after vet visit. Shots or food?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 6 months and 16 days old | 115 lbs

I just took my dog to the vet Tuesday he’s had weight loss and a lot of poop issues. But 5 days before the vet he was fine and solid and only a tiny bit mushy and they did a fecal test.. it cameback negative for anything but now after the vet he came home and it’s been like this and like diarrhea. Is it cause of his rabies and distemper shot or from the wet food i gave him after the visit ? He can’t even control holding it and had liquid poop in my bedroom thts unlike him.

This question includes photos that may contain sensitive content. Click to view.

View more to consider that the photos may include sensitive content.

1 Answer

Most Helpful Answer

Image profile

Answered By Laura Johnson VMD

Veterinarian

Published on September 13th, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Poor Bear! Diarrhea can be a sign of a vaccine reaction but since he was having abnormal stools prior to the Vet visit I think it is likely a continuation of his previous issues. I would still ask for deworming medications as adult worms do not always shed eggs that will show up in the stool sample. I would also change his food and get him on a puppy food that doesn't contain chicken. It is possible the weight loss and chronic abnormal stools are due to a food allergy. If that doesn't improve his weight and stools then I would do blood work and B12/folate/TLI/PLI testing for intestinal and pancreatic disease. Causes of poor weight gain/weight loss and diarrhea in a puppy are: intestinal parasites, food allergy/intolerance, inflammatory bowel disease, pancreatic insufficiency. Good luck!

Vote icon

1Pet Parents found this answer helpful

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
New Pet
Why is my new pet biting? Is she stressed or scared in her new home?
New pet biting? A Licensed Vet Tech shares expert advice on how to gently acclimate your new companion to their home, reduce stress, and build trust. Get guidance for a happy pet.
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