How to Protect Your Dog from Blue-Green Algae This Summer

Unfortunately, there is not much that can be done if the dog has come into contact with an extremely toxic strain of cyanobacteria. These cases most often result in death because fatal neurological damage or liver failure can occur quickly, even when a dog is taken to a vet immediately.

“If it is one of the poisonous strains that causes neurological or liver damage, recovery is not likely,” Hoggan said. “Sadly these cases, though rare, are most often fatal. If the species is one of the less poisonous species that causes painful irritation, the prognosis for recovery is better after treatment.” 

How to Protect Your Dog  

Because toxic cyanobacteria can be so dangerous, prevention is the best practice. 

Do a thorough check of the water before letting your dog swim. Avoid any stagnant or dirty water, and never let them swim in or drink from water with a film on its surface, especially if it appears bright green, blue, brown, or red. 

“Though fatal poisoning is uncommon, the best thing concerned pet owners can do is keep an eye on their dogs when near wild water sources and prevent them from drinking standing water,” Hoggan said. “Be prepared on hikes and walks by bringing more clean drinking water for your dog than you think you need. It is always better to be safe than sorry.”

You can also research the lake or water source you plan to visit in advance to see if cyanobacteria has been reported there. Each state and locality has its own system for tracking toxic cyanobacteria and algae blooms, so research what is available where you live. 

For instance, several local governments across the country have already issued warnings about blue-green algae blooms this summer, including in Oklahoma, Colorado, Indiana, Maine, Kansas, Florida, and New Mexico. It can be almost anywhere.

If you suspect you’ve spotted a cyanobacteria bloom, take a photo and send it to your local department of environmental safety. 

“You might be able to bring that to somebody’s attention and begin some monitoring,” Caron said.