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Puppy sniffed onions, now lethargic & breathing heavy. Is it toxic?

Updated On September 23rd, 2025

Pet's info: Dog | Golden Retriever | Male | unneutered | 4 months and 19 days old

my dog is four months old and i found him sniffing around our onion garden and he smelled like onions but the onions seem untouched also he breathes heavily once in a while without doing any effort and seems lethargic but he also plays when he feels like it (75% of the time) but he is still new to this house . also thank you so much for your answers they are very helpful

1 Answer

Most Helpful Answer

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Answered By Ann Dion, DVM

Veterinarian

Published on October 20th, 2018

Hello and welcome to Petco Pet Education Center, formerly Petcoach. Onions can be very toxic and cause damage to the red blood cells. Often clinical signs are delayed, starting at about 24 hours and peaking at 72 hours post ingestion. Trying to decrease the amount of toxin absorbed right away is recommended, so if there is a chance that Gucci ate any of the onions then I would suggest bringing him to the vet to have him vomit (if it has been <2 hours) and activated charcoal. Otherwise, monitor him very carefully for signs of lethargy, weakness, a high heart rate, brown/dark urine, brown/dark gums, inappetance, etc. If you see any of these signs bring in Gucci right away to the vet. Best of luck with Gucci!

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