06/04/2026
Dear DCVS Clients,
Please Share. You might save someone from an unexpected heartache this summer.
I usually don't make this post til later in the summer, but with the very early heat and dry conditions we are already seeing water-related issues.
The first problem with warm, stagnant water is high bacterial counts. Run-off and f***s in stagnant water can contain bacteria like E. coli, Salmonella, and Campylobacter which can cause severe gastroenteritis. Stagnant water can also harbor leptospirosis, a dangerous bacteria spread by the urine of infected wildlife like rodents and raccoons. It thrives in warm, moist areas and can survive for weeks in standing puddles. Ingestion or contact with broken skin can cause kidney failure, liver damage, and is also transmissible to humans. Giardia and cryptosporidium are non-bacterial organisms that also thrive in warm, stagnant water that can also make your pet sick.
We can also see skin infections when dogs swim in water with high bacterial counts.
I've already been seeing lots of vomiting and bloody diarrhea related to gross water sources outdoors.
The most serious concern is blue-green algae in natural bodies of water in Iowa. This includes creeks, ponds, puddles, lakes, rivers, and even bowls and containers of water left outside. Blue-green algae, more appropriately called cyanobacteria, are a bacterium rather than an algae species. The bacteria produce two deadly toxins. One causes liver failure, and the other affects the body's nerves. Symptoms can occur as soon as 5 minutes (neurotoxin) and as late as a few days (liver toxin). No antidote for cyanobacteria toxicosis exists, so prevention is our best defense.
Symptoms of the neurotoxin include disorientation, seizures, excessive drooling, inability to walk, difficulty breathing, paralysis, and coma. Dogs affected with the neurotoxin develop fatal symptoms within minutes to hours, often passing away very quickly.
Symptoms of the liver toxin are more non-specific and include gastrointestinal symptoms like vomiting, diarrhea, and loss of appetite. As the liver becomes more affected, the skin and eyes turn yellow.
There is no easy test for cyanobacteria, and a diagnosis is often made from symptoms and a history of swimming in dirty water.
Dogs who ingest potentially contaminated water should be made to vomit as soon as possible. Fresh hydrogen peroxide dosed at 1ml per pound of body weight (capping at 25mls for larger dogs) should be given. This should be included in all hiking packs or car first aid kits. The dog can be treated supportively at the veterinarian with IV fluids and medications to help the liver, but the prognosis is often poor. PREVENTION IS THE KEY.
PLEASE do not take your dog swimming or allow them to drink from bodies of water with obvious algae-looking growth. Blue-green algae, despite its name, can also cause growth that looks red or brown. It can often resemble paint on the surface of the water. Blue-green algae blooms when water becomes stagnant and the temperature rises, so we tend to see it more in late summer, but this can be earlier in a drought year.
Buckets, Barrels, tarps, bird baths, and other items in the yard that can hold rainwater and sit stagnant can also be a source of issues.
https://programs.iowadnr.gov/aquia/beaches