How to Protect Your Dog from Blue-Green Algae This Summer

Dogs are especially susceptible to cyanobacteria poisoning because they often play and drink at the water’s edge and don’t know they should avoid any green, algae-like substances that may be floating on the surface. 

“Though fatal poisoning is uncommon, the best thing concerned pet owners can do is keep an eye on their dogs when near wild water sources and prevent them from drinking standing water,” Sarah Hoggan, veterinarian and medical director of the VCA California Veterinary Specialists, said.

Signs and Symptoms of Cyanobacteria Poisoning 

Cyanobacteria toxins can have different effects on dogs. Certain toxins can cause treatable symptoms, such as skin irritation or gastrointestinal irritation, while other toxins are much more dangerous and can cause severe neurological damage, liver failure, and even death. 

“It really depends on the species of cyanobacteria,” Sarah Hoggan, veterinarian and medical director of the VCA California Veterinary Specialists facility in Murietta, California, said in an email interview. “Like any naturally occurring substance, like mushrooms, some species are more poisonous than others. In addition to the species, it also depends on the concentration of the cyanobacteria in the water.”

Symptoms appear within 60 minutes of exposure, often in under 30 minutes, according to Hoggan. Symptoms may include: 

• Itching
• Redness
• Blisters
• Vomiting
• Diarrhea
• Tremors
• Convulsions
• Hypersalivation
• Watering eyes
• Uncontrolled urination
• Acute paralysis
• Trouble breathing
• Shock

What to Do if Your Dog Is Exposed 

If you know or suspect your dog has consumed or come into contact with toxic cyanobacteria, it is important to get them to a veterinarian as soon as possible. Be prepared to share as many details as possible about the exposure—whether your dog touched the bacteria or consumed it, what the water looked like—to assist with diagnosis and treatment. You should use caution in handling your dog as people can also be at risk for skin irritation and other health problems from cyanobacteria. Wear gloves and wrap your dog in a blanket or towel before handling whenever possible.