How to Protect Your Dog from Blue-Green Algae in Indian Lakes and Ponds

In this guide

Summer heat combined with stagnant water is a perfect breeding ground for cyanobacteria, commonly called blue-green algae. Many Indian cities have lakes, temple tanks and ponds that dogs love to wade into on a hot day, and a number of these water bodies are affected by algal blooms during the drier, hotter months. What looks like harmless pond scum can be lethal within minutes.

What blue-green algae actually is

Despite the name, blue-green algae is not really algae. It is a type of bacteria called cyanobacteria that thrives in warm, still, nutrient-rich water, exactly the conditions found in many urban lakes during the pre-monsoon summer months when water levels drop and pollution concentrates. Some species of cyanobacteria release toxins into the water as they bloom and die off, and it is impossible to tell a toxic bloom from a harmless one just by looking at it.

Why it is so dangerous

The toxins produced, mainly microcystins and anatoxins, target the liver and nervous system. Microcystins cause severe, sometimes irreversible liver damage. Anatoxins act on the nervous system and can cause death within minutes to a couple of hours. Because dogs drink pond water while swimming, lick algae off their fur while grooming, or simply gulp water while playing fetch near the shore, they are more exposed than most other animals that visit the same water body.

What a bloom can look like

• A green, blue-green or brownish scum or paint-like film on the surface
• Water that looks like thick pea soup
• Green flecks or clumps floating near the edges
• A musty or swampy smell
• Sometimes no visible sign at all, especially if the bloom is suspended below the surface

Symptoms of poisoning

• Vomiting and diarrhoea, sometimes with blood
• Weakness or collapse
• Drooling and disorientation
• Muscle tremors or seizures
• Pale or yellowish (jaundiced) gums, pointing to liver damage
• Difficulty breathing

Prevention

Keep your dog on a leash near unfamiliar lakes and ponds, particularly during the hot, dry months before the monsoon when blooms are most common. Avoid water with any visible scum, discolouration or dead fish nearby. Carry fresh drinking water on walks so your dog is not tempted to drink from open water bodies, and rinse your dog thoroughly with clean water if it has been swimming somewhere you are unsure about, to remove any algae from the coat before it can be licked off.

What to do if you suspect exposure

There is no antidote for cyanobacteria poisoning, which makes speed critical. If your dog has been in a lake or pond and starts showing any of the symptoms above, get to a veterinarian immediately rather than waiting to see if it passes. Early decontamination and supportive care meaningfully improve the chances of survival.

Article content © Ravi Teja. All rights reserved.