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My dog has a mysterious dark green stain after boarding. What is it?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 58 lbs

I have been boarding my dogs at Broadmoor Animal Hospital for the last 3 days &when I picked them up Leroy has a really big dark green stain all down his chin, chest, and foot. They said it wasn’t like that yesterday and they don’t know what happened and how sorry they are. He didn’t have anything green to eat & it wasn’t from a toy. They said it might be from his collar. Leroy’s collar is blue & no coloring came off when I wet the collar and rubbed it. what could it be?

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1 Answer

Most Helpful Answer

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Answered By Makenzie Kurth, DVM

Veterinarian

Published on March 23rd, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! This is a bit of a mystery but maybe it was from humping something- Just based on locations of the staining. What about a new bed or towel or toy at the facility? Some new fake grass he rubbed on? I don’t see this being a grass stain, it seems too dark. Very weird. Perhaps ask to tour the facility and look around? As far as Leroy’s safety, I suppose it could have been some something toxic but probably not. I’d recommend washing thoroughly with a dog shampoo and watching for any signs of toxicity or irritation (itching, vomiting, tremors, seizures, lethargy). Best of luck to you and Leroy!

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