http://www.petpoisonhelpline.com/poison/blue-green-algae

Alternate names: Cyanobacteria, algal, Microcystis, Anabena, Aphanizomenon, cyanotoxin, anatoxin

There is no antidote for the toxins produced by blue-green algae. Immediate veterinary care is imperative. If you suspect your dog was exposed to blue-green algae, contact Pet Poison Helpline immediately for guidance.

Very small exposures, such a few mouthfuls of algae-contaminated water, may result in fatal poisoning.

Common signs to watch for:

• Vomiting
• Diarrhea
• Blood in stool or black, tarry stool
• Pale mucous membranes
• Jaundice
• Seizures
• Disorientation
• Coma
• Shock
• Excessive secretions (e.g., salivation, lacrimation, etc.)
• Neurologic signs (including muscle tremors, muscle rigidity, paralysis, etc.)
• Blue discoloration of the skin and mucous membranes
• Difficulty breathing
• Death

Please keep your dogs out of the water.