Toxic algae can pose a hidden danger to dogs that swim in freshwater lakes and canals. These algae, known as cyanobacteria or blue-green algae, can multiply rapidly, forming visible blooms or scums on the water's surface. While not all algae are harmful, some species produce toxins that can be dangerous to humans and animals. A 2017 study led by FIU researcher Schonna R. Manning explored these cyanobacteria and their potential to produce deadly toxins. These toxins can affect the nervous system, cause skin irritation, or lead to organ damage. For dogs, the risk is heightened because they often interact with water by swimming, licking their fur, or ingesting algae that may have stuck to their coats. Dogs are particularly vulnerable because they may groom themselves after swimming, accidentally consuming algae or toxins that have collected on their fur. In some cases, this can lead to severe illness or even death. Manning and her team were the first to detect a potent neurotoxin called dihydroanatoxin in algal mats, which was suspected in several dog deaths. A 2023 study by Manning found this neurotoxin in the digestive system of a dog that died within two hours of consuming algae. These incidents highlight the need for awareness and caution around water bodies that may be contaminated. Harmful algal blooms tend to occur more frequently during warmer months when water temperatures rise and conditions become favorable for algae growth. The presence of excess nutrients in waterways can also contribute to the formation of these blooms. Manning advises pet owners to look for signs of potential contamination, such as discolored water, surface scum, or a foul odor. If a body of water appears unusual or smells bad, it's best to avoid it. Public health alerts and warning signs at lakes and canals can provide important information about water safety. To help keep pets safe, pet owners should check online resources or local government websites for current water quality reports and alerts before swimming with their dogs. If a water body is unsafe for humans, it is also unsafe for pets. Additionally, owners should inspect their dog’s fur after swimming to ensure no algae or toxins remain. By staying informed and cautious, pet owners can help prevent tragic incidents and enjoy outdoor activities safely with their furry companions.