Blue-green algae typically grows in lakes, ponds and slow moving streams, as well as marine water bodies throughout the UK. When favourable environmental conditions are present (sunny weather, high water temperature and abundant nutrients), blue-green algae quickly multiply forming massive growths, also known as a ‘bloom’. Blooms occur most commonly in late Spring, Summer and early Autumn.
There are many species of blue-green algae; only some produce toxic compounds. The toxins produced are not only poisonous to dogs but also dangerous to cats, cows, horses and humans. These toxins result in rapidly developing signs of ill health, and exposure frequently causes fatalities. It is thought that concentrated scum at the edges of water bodies present a highly toxic dose in a very small volume.
The mechanism of toxicity depends on the species of algae: some produce liver-specific toxins and others produce toxins that affect the nervous system. Signs often start within 1 hour to 24 hours of exposure.
Take your pet to your nearest vet clinic straight away. The vet will examine your dog and decide what treatment is necessary. To start, vomiting may be induced to decontaminate the stomach. Activated charcoal may then be given to absorb toxins. They may require oxygen and intravenous fluids to help flush the toxins out of their body. Blood tests are often required to monitor liver and kidney function. If your dog is seizuring, or has already developed liver failure, intensive symptomatic and supportive care will be administered. Unfortunately, in animals showing symptoms of toxicity, the prognosis is poor.
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