Toxic algae can pose a hidden danger to dogs swimming in freshwater
Diving into cool water can be a quick way to escape the summer heat, but during certain times of year, freshwater can pose hidden dangers to people and pets.
Toxic algae known as cyanobacteria, also called blue-green algae, can pose an unexpected threat to dogs swimming in freshwater. These toxins, which can affect a dog's nervous system or cause skin irritation and organ damage, are particularly dangerous because dogs often swallow water while swimming and can ingest algae or toxins clinging to their fur.
In severe cases, exposure to these toxins can be fatal. Notably, researchers have recently identified a potent neurotoxin called dihydroanatoxin in algal mats, which was implicated in several canine deaths in 2020. A 2023 case study detailed a dog that died within two hours after ingesting contaminated algae. Cyanobacterial blooms, which can produce these toxins, are more likely to occur during warmer months when water temperatures rise and nutrient-rich runoff enters waterways.
Pet owners should be vigilant for water that looks discolored, smells foul, or contains scummy mats. Public health alerts and warning signs at lakes and canals can provide additional information. By checking local advisories and avoiding potentially contaminated water, pet owners can help ensure safe swimming experiences for their dogs.
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