This fantastic weather we’ve all been enjoying has also got our pets outside being super active and having their own set of great adventures. Not surprisingly the incidence of mishaps rises correspondingly. One summer culprit that can be found lurking in some of our fresh and brackish water areas is a lethal threat to our pets, to livestock and to humans.

Whilst we would like to think of our waterways as pristine, clear and un-spoilt, chemical and waste runoff can make this far from the truth. Blue-green algae hang at the edges and contain cyanobacteria, primitive photosynthetic organisms, some of which can produce cyanotoxins. These toxins can attack the body’s neurological, liver and skin organ systems.

Each type of bacteria produces distinct toxins and thereby attacking different systems. In New Zealand this will most commonly be a neurological toxin. These natural chemicals bind to ACH receptors in an animal and can kill within Minuits, leaving very little trace. Specialised laboratory tests on stomach contents can be used to confirm this cause of sudden death if the post mortem samples are sent with a specific request. Some of the hot spots for cyanobacterial toxicosis include the Waikato and Bay of Plenty river and lake systems.

With many people unaware of the presence of this toxin, it is highly likely that a significant number of undiagnosed sudden deaths in these areas could have been caused by this organism. Local councils play an important role in reporting the presence of toxin producing blue-green algae in their individual areas, many having large risk signs displayed.

Unfortunate dogs are usually affected by drinking algae laden water in eddies and pools at the rivers edge. Contrary to popular belief the water does not need to be sitting still. Affected dogs will initially present confused and seeking attention or reassurance.

Respiration and heart rates rise and the white third eyelids can slide half way across in-front of the eyes. Signs progress to stumbling, in-coordination and then convulsions. With severe cases breathing will eventually become very shallow, tongues and gums blue from asphyxia and the heart will arrest.

This tragedy can all unfold in as little as 30 Minuits. Please be aware of this potential cause of poisoning. Don’t allow your canine friends to drink from fringing water with algae obviously present, direct them instead to some fast flowing, clear freshwater.

If you suspect possible poisoning or observe any of the signs I have discussed please rush to the closest vet to get potentially life saving assistance. Kind regards, Dr Alex Melrose.