Current weather conditions favor the proliferation of cyanobacteria, commonly known as "blue-green algae." These microorganisms thrive particularly well in warm, stagnant, nutrient-rich waters. The high summer temperatures, combined with the increased presence of nutrients in water bodies, create an ideal environment for their rapid multiplication.

The dangers of cyanobacteria for pets

Residents in the Halifax region of Nova Scotia experienced the sudden loss of their dog. The dog died after being in contact with cyanobacteria, commonly called "blue-green algae," for only a few minutes. The Halifax Veterinary Hospital confirmed that the dog died after spending about five minutes in the water at Long Lake in Hammonds Plains on June 16, 2023.

After this short swim, the dog was unable to stand, unresponsive, and appeared to have seizures. It died on the way to the veterinary hospital, about two hours after being in the water. This tragedy highlights the dangers that cyanobacteria pose to our pets.

How to recognize blue-green algae

Blue-green algae, or cyanobacteria, can be difficult to identify with the naked eye, but there are some visual signs that can help. They can appear as thin greenish layers on the water's surface, similar to paint or scum. Sometimes they form dense floating mats or clumps that can be blue-green, yellow, brown, or red. Contaminated water may also emit an unpleasant odor, similar to that of rotting plants. It is important to remain vigilant and avoid any contact with water displaying these characteristics to protect your pets and yourself.

Symptoms and precautions to take

Exposure to blue-green algae can make humans sick and cause the death of pets. Symptoms can appear a few hours or minutes after contact with the algae, according to veterinarians. Signs of intoxication in animals include vomiting, diarrhea, skin rashes, difficulty breathing, respiratory failure, or liver failure. Sudden death is also possible.

To protect your pets, it is essential to take certain precautions:

  • Avoid letting your pets swim in stagnant waters, especially if you see signs of algal proliferation.
  • Monitor public health advisories regarding local water bodies.
  • If your pet comes into contact with potentially contaminated water, rinse it immediately with clean water and contact your veterinarian.

By becoming aware of the risks associated with blue-green algae and taking precautionary measures, we can protect our pets and ensure their safety during their aquatic adventures.

To read more about the development of these algae and learn how to identify them, visit the Government of Quebec's website.