Toxic algae in freshwater ponds have killed several dogs across the country. Please be careful and if in doubt at all, don't let your dog swim in a pond until the weather is cooler.
There are several articles out there discussing it. Here is one
https://www.cnn.com/2019/08/11/us/th...rnd/index.html
It's not just in the southeast. It's happened in Texas and I believe Colorado. So sad.
ETA: Sorry mods I just saw the other thread on this topic. You can delete this one.