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My dog swam in blue-green algae. She's acting strange. Is it serious?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 8 years and 10 months old

My dog has just been swimming in a lake that has blue green algae in it, we immediately pulled her out but now she is acting strange. It might be the fact that yesterday she ate an acorn, I think. Any ideas?

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on August 25th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! This can actually be quite severe of a toxicity and while it is not for sure that Jessie was exposed to it, it is certainly possible. There are several signs that can develop secondary to this toxicity. Most concerning ones are signs secondary to neurologic effects and liver failure such as melena (black stools), severe vomiting, lethargy, seizures, difficulty breathing, pale gums and/or collapse. Given that she is already acting strange, she should be evaluated by a veterinarian to start checking for any of these possibilities. I hope that she is fine and she was not actually exposed. Good luck and have a great day!

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