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Is dog sluggish and vomiting brown normal after hydrogen peroxide?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | unneutered | 8 years and 7 months old | 7.54 lbs

Dog ate Ambien so the vet on over night call told us hydrogen peroxide at which point we administered until he threw up everything and it's MX took him to the vet the next day they said he looks fine and everything he's been eating plane boiled chicken and drinking water off an on but seems very sluggish and has still been throwing up off an on as either slimy or it's got like brown almost like when blood is dead that brownish color is this normal from the side effects of hydrogen peroxide or wh

1 Answer

Most Helpful Answer

Kevin Sanada, DVM

Answered By Kevin Sanada, DVM

Veterinarian

Published on May 25th, 2018

The hydrogen peroxide can definitely cause a dark discoloration of mouth and esophagus; and can also lead to ulcerations in the esophagus and stomach. This would also cause there to be blood noticed in the saliva and vomit. If he's eating well, then I wouldn't be too worried about severe damage to the stomach or esophagus, but the fact that he's vomiting does indicate that there is still some irritation there.

The sluggishness could be due to the Ambien, or could indicate another problem causing him to not feel well. It's best to have a vet evaluate Chulo sometime soon to ensure there is nothing serious going on.

I hope that helps and Chulo feels better soon.
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