06/10/2025
We’re approaching summer, so let’s talk about toxic algae.
The kind we most often deal with in our area is blue-green algae, which is in fact a bacteria known as cyanobacteria. This bacteria can multiply rapidly in warm, nutrient-rich water. These population explosions are called “blooms.”
Not all cyanobacteria is toxic, however it is best to exercise caution. Algal blooms can look similar to paint or a film on the surface of water, often blue or green, but can also be red or brown. They can occur in lakes, streams/rivers, and even the ocean or the Puget Sound. Dead fish or wildlife may be seen in the water.
Symptoms of toxicity can vary depending on the species of cyanobacteria present, but watch out for the following in cats and dogs:
- Gastrointestinal issues such as vomiting and diarrhea
- Weakness, collapse, tremors, seizures, paralysis, and muscle rigidity
- Difficulty breathing, pale gums
Unfortunately, cyanobacteria toxicity can lead to sudden death. Be cautious about the water your pets come into contact with. Horses, livestock, and humans can also be harmed!
If your pet has come into contact with toxic algae, it is best to go to an emergency clinic. They will need prompt treatment, which may include oxygen supplementation, IV fluids, and/or supportive medications.
You can find an interactive map here that may show current harmful algae blooms, but always use caution and your best judgement: https://www.nwtoxicalgae.org/FindLakes.aspx
For further reading, please refer to the following websites:
https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information/blue-green-algae-poisoning-cyanobacteria-toxicosis
https://doh.wa.gov/community-and-environment/contaminants/cyanobacteria