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Why is my dog vomiting, constipated, and scooting after diet change?

Updated On September 23rd, 2025

My dog has vomited 2x over the past 24 hours. He vomited yesterday afternoon and last night at some point while I was asleep. He also had some constipation last night and struggled to poop. He did that thing where he rubs his butt on the grass. The throw up is clearly his food but it is digested, it’s not the same way it went in. It’s a mush. He’s been on an elimination diet for 8 days ago. I think I transitioned him too quickly (over 3 days). But it’s been days now, Idk what it is

1 Answer

Most Helpful Answer

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Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

Veterinarian

Published on July 31st, 2021

Hi and thanks for your request. This presentation seems to be due to a gastritis, which is likely to be secondary to dietary indiscretion. As a first approach, I would suggest to start feeding with a bland diet based on boiled chicken and rice in small portion every 6 hours for the following 48hours. Then gradually reintroduce the normal diet over 5 days. I would definitely recommend a veterinary check up if the signs persist or you notice diarrhoea, more vomiting, lethargy or inappetence.

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