Dangers of Blue Green Algae To Dogs

May 3

Written By Dana Brigman

Safety reminder for our water-loving dogs….

A dip in cool water could be deadly for your dog.

As the temps rise, the growth of blue-green algae begins.

Cyanobacterial Blooms Deadly To Dogs

Blue-green algae, also known as cyanobacteria, can pose a deadly risk to dogs if they are exposed to it. This type of algae produces microcystins and neurotoxins that can cause severe health problems or even sudden death if exposed (ingested or simply walking in toxic water). The toxins affect the liver, nervous system, and other organs in the body.

Dogs can be exposed to blue-green algae by drinking even the smallest sip or swimming in contaminated water. Symptoms of exposure can occur within minutes and accelerate quickly. Symptoms include vomiting, diarrhea, confusion, wobbly, seizures, accelerated heart rate, difficulty breathing, and even death. Exposure to blue-green algae can be fatal.

Summer fun often means water adventures with your dog — but there's a silent danger lurking in lakes, ponds, and even slow-moving rivers that too many pet parents overlook. Blue-green algae, also known as cyanobacteria, can bloom rapidly in warm weather and poses a serious — often fatal — risk to dogs.

I’ve sadly heard far too many stories of dogs that never made it home after a day of swimming. So let's dig into what you need to know, how to reduce the risk, and what to do if your dog is ever exposed.

What Is Blue-Green Algae (Cyanobacteria)?

Blue-green algae isn’t really algae at all — it’s a type of toxin-producing bacteria that thrives in warm, stagnant water. You may notice it as a greenish, blue, or brown scum on the surface of water, but it’s not always visible. Sometimes, the water may just look a little “off” — foamy, discolored, or musty-smelling.

When blooming, these bacteria release microcystins (liver toxins) and neurotoxins, which can severely damage your dog’s liver, nervous system, and other internal organs.

How Dogs Get Exposed to Toxic Algae

Drinking from contaminated lakes, ponds, or puddles
Swimming or wading in water containing the bloom
Licking their paws, fur, or coat after contact
Even inhaling aerosolized toxins in mist from the water

It doesn’t take much. A single gulp or splash can be enough to cause severe symptoms — or worse.

Symptoms of Blue-Green Algae Exposure in Dogs

Symptoms often appear within minutes to hours, and they escalate quickly. Immediate veterinary care is crucial. Signs can include:

Vomiting or diarrhea
Drooling or foaming at the mouth
Weakness, staggering, or collapse
Disorientation or confusion
Seizures or tremors
Rapid breathing or difficulty breathing
Accelerated heart rate
Pale gums
Sudden death

If your veterinarian has confirmed a diagnosis of cyanobacteria toxicity, time is absolutely critical.

High-Risk Conditions for Algal Blooms

Even if a lake or pond looked safe last week — that can change fast.

Hot, sunny days (especially over 75°F)
Low wind or stagnant water
Farm runoff or fertilizers nearby
Shallow shorelines or algae mats

Don’t assume that clear water means safe water. If you're unsure — don’t risk it.

Safe Alternatives to Keep Your Dog Cool

Kiddie pools in the shade
Sprinklers on the lawn
Hose-down sessions (bring fresh water everywhere)
Beach outings only where water is actively monitored and tested

Avoid temptation by planning water play at home when you're uncertain about local water quality.

What to Do If Your Dog Has Been Exposed to Blue-Green Algae

Act FAST:

Rinse thoroughly with clean, fresh water (don’t wait until you’re home — rinse on-site if you have water with you)
Call Poison Control immediately:
ASPCA Animal Poison Control: (888) 426-4435
Get to the nearest veterinary hospital or emergency vet without delay

Keep these numbers saved in your phone — along with directions to the nearest ER vet, even if you're traveling.

Holistic Support On the Way to the Vet

While driving to the vet, you might consider these supportive measures:

Liver support: Milk thistle, dandelion root, or a general liver tonic may help support detox pathways
Homeopathic Remedy: Phosphorus 30c
Essential oils: A calming, immune-boosting Raindrop technique application (if your dog tolerates oils well) may offer energetic support — especially using liver-supportive oils like German chamomile, Helichrysum, or Copaiba. Frankincense will never hurt.
Energetic & Emotional grounding: Flower essences, homeopathy, or Reiki may provide vibrational comfort, but should never delay emergency care

If you keep a first aid kit in the car (and you should!) — make sure it includes fresh water, detox support supplements, and essential oils that are safe for acute use.

Want to see what’s in my travel kit? View my suggested first aid kit here

Top 5 Things You Can Do Today

Never let your dog drink from stagnant ponds, lakes, or puddles — bring fresh water on every outing.
If the water looks foamy, discolored, or scummy — avoid it entirely.
Save emergency vet contacts and poison control in your phone now.
Keep detox support like milk thistle and liver-supportive essential oils on hand.
Opt for a backyard pool or sprinkler day when in doubt — it’s not worth the risk.

Test Your Water Source For Blue-Green Algae

5Strands Now offers a testing kit for water sources.

Statements in this blog have not been evaluated by the FDA. Educational content only. Not intended to diagnose, treat, cure, or prevent any disease. Please do your own additional research, consult your vet as needed.

Visit My Affiliate Links for curated quality products mentioned above!
https://welloiledk9.com/products

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Dana Brigman