Algal Blooms Toxicity

My barn has beach access to one of the great lakes. The county and state run beaches/parks do daily water quality monitoring and I always check before riding down and going to for a walk (or swim) in the water. This afternoon, I checked and both nearby beaches reported the water quality as “good”.

This evening, I saw one of the parks posted that an algal bloom has been observed at the nearby park after I had already rode down. They said testing has shown the presence of a harmful algae bloom, but algal toxins fall below the unsafe level. Visitors are encouraged to maintain a level of awareness while visiting and they will continue to monitor the situation.

I don’t think my guy ingested much, if any, of the water but he was nosing around playing in it and walking in it. Reading online, toxins produced by the algae are harmful to animals drinking the contaminated water. Microsystin, one of the toxins, affects the gastrointestinal tract, causing colic and diarrhea in horses. In severe cases, liver damage from the toxin can be fatal, especially in dogs that seem to be more susceptible than some other animals. At the very worst, it can cause acute death.

We were down around 7 hours ago and I did a check on him tonight and everything seems fine, happy gut sounds and normal demeanor. There were no visible blooms where I was, though that doesn’t insure the algae aren’t there.

I overly worry about everything, is this cause for anything other than monitoring at this point?

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It sounds like the parks workers were proactive in posting before the levels were dangerous. Also horses have much higher body weight than dogs.

I would suggest asking on a local FB horse group or ask a local vet because this must be an annual event there.

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It tends to happen in the summer when it starts to get really hot. It’s thought that all of the nitrogen fertilizer runoff into the lake is the main culprit :disappointed: Thankfully, this summer has been relatively mild. Further west, the lake gets it worse and many area issue boil alerts. We don’t typically get it that bad where we’re at, but it’s close enough that water quality is monitored daily.

I’ll check with the state horseman’s council, that’s a good idea thanks!

Apparently you’re not allowed to ask for advice on their Facebook page :expressionless:

I’d definitely run it by your vet just to ease your mind.

Bentonite clay can be really good at binding to toxins like that, so if you can use a few tbsp of that a day for a few days, that may help. One of the usually widely available products is Redmond Daily Gold, but if you find a feed store has just plain paper bags of bentonite clay (also called montmorillonite ) then that’s way cheaper.

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Knock on wood I think we’re all fine. I checked on him at 5:30AM yesterday and he was happily napping in a pile of hay. Happy gut sounds, no diarrhea, pink gums, bright eyes, and normal colored urine (he kindly peed for me after he stood up :joy:).

The beaches are still labeling the water as GOOD so the notice of the algae should be more of a heads up vs anything unsafe. We did a drive last night and he was good then too. Still keeping an eye on things though. Really good to know on the end tonite clay, thanks @JB

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