We all know that summer is a beautiful, fun-filled time of year for Minnesota. It’s a chance to get outside and use the 10,000 lakes that give the state its nickname. But summer also bring hazard do some of these lakes. We already covered the E. coli outbreak on several Minnesota lakes. But there’s another hazard to be aware of. Read on to learn everything you need to know about the toxic algae responsible for killing dogs that has been found in Minnesota.

Warm weather can bring danger to some Minnesota lakes. The hot temperatures allow excess cyanobacteria to flourish. The bacteria gather in mats of blue-green algae.
Mark Sadowski/Flickr
The algae isn't usually harmful in small amounts. But when algae blooms cover large sections of lake, it can be dangerous for humans and pets.
MPCA Photos/Flickr
So where does blue-green algae occur? The blooms affect lakes across Minnesota, preferring shallow waters that warm up quickly under the sun.
MPCA Photos/Flickr

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Blue-green algae looks similar to other forms of algae, so it's hard to tell when you've encountered it. The Minnesota Pollution Control Agency has a few simple tests, but they are not fool-proof.
MPCA Photos/Flickr
It is best to avoid waters that might be affected. If the bacteria is swallowed, it can lead to eye and throat irritation, headache, nausea, diarrhea, and vomiting. Do not use affected water for swimming, bathing, washing dishes, or drinking water.
MPCA Photos/Flickr
Dogs are even more at risk because they swallow more water when swimming. This year, a dog died at Crawford Lake in Wright County. Another became ill at Loon Lake in Waseca County.
MPCA Photos/Flickr
In total, 11 dogs have fallen ill or died from blue-green algae in Minnesota since 2013. To protect your pups, it is best to stay out of possibly affected waters until the algae blooms subside.
MPCA Photos/Flickr

Do you have any other tips for staying safe in Minnesota lakes this summer? Feel free to share your advice in the comments below!

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