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  1. Home
  2. Harmful Algal Blooms (HABs) in Water Bodies

How to Protect Your Pooch

How to keep your Dog Safe from Toxic Algae:

Spot the algae

Don't let your dog drink or swim in water if:

  • It's slimy or looks like foam, scum or mats on the surface of the water.
  • The color is weird. Harmful algal blooms can be blue, bright green, brown or red and may look like paint floating on the water.
  • It stinks. Some (but not all) harmful algae produce a nauseating smell.

Treat exposure

If you think your dog has gotten into a harmful algae bloom:

  • Rinse him or her off immediately. Wear gloves to protect yourself and give your dog a thorough rinse in clean, fresh water.
  • Watch for symptoms. Symptoms can arise anywhere from 15 minutes to several days after exposure. Take pets to the vet immediately if they suffer from:
    • Diarrhea or vomiting
    • Weakness or staggering
    • Drooling, difficulty breathing or convulsions
  • Report the bloom to your state's health department.
    • Find a contact in your state
leash and ball

What are Toxic Algae?

Algae occurs naturally in water but excess nutrients from a variety of sources contributes to a growing number of harmful algal blooms. These sometimes toxic blooms now occur in every state in the nation. Toxic algae can sicken people as well, but it is especially harmful to animals. Small clusters of dog deaths have been reported over past summers after pets were exposed to algae toxins.

  • Learn more about toxic algae

For additional information for pet owners and veterinarians, please visit these Centers for Disease Control websites:

  • Protect Yourself and Your Pets
  • Cyanobacterial Blooms: Information for Animal Owners
  • Cyanobacterial Blooms: Information for Veterinarians

Harmful Algal Blooms (HABs) in Water Bodies

  • Basic Information on HABs
    • Learn about HABs
    • What Causes HABs
    • Exposure to HABs
    • Effects of HABs
    • What You Can Do
  • Trends, Monitoring Results & Forecasts
    • HAB Monitoring and Trends
    • HAB Forecasts
    • HAB Advisories
  • Managing HABs
    • Managing HABs in Surface Water
    • Managing Algal Toxins in Drinking Water
    • Managing Algal Toxins in Recreational Waters
  • HAB Laws, Tools and Data
    • HABHRCA
    • HAB Tools
    • HAB Data
  • HAB Methods & Research
    • HAB Methods
    • HAB Research
  • HAB Resources
    • EPA Outreach on HABs
    • Labs that Analyze for Cyanobacteria and Cyanotoxins
    • State & Tribal HAB Programs and Resources
    • State & Tribal Toxin Thresholds and HAB Advisory Decision Methods
    • HAB Resources from Other Federal Agencies and Organizations
    • Recent Papers, Upcoming Meetings and Webinars
Contact Us about HABs
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on June 4, 2025
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