6 Scary Diseases Your Dog Can Get From Water

Some dogs just love the water and sometimes dogs can get carried away when you’re out walking them. While the vast majority of pets get through their water experience with nothing more than a wet coat, there are some organisms in common recreational water sources than can pose a health risk for your dog. Here are 6 scary diseases your dog can get from water.

1. Leptospirosis

Leptospirosis is a common waterborne disease caused by the bacteria Leptospira. Many strains of Leptospira are found worldwide, but it is most usually found in warm areas with high rainfall. The bacteria can infect both humans and dogs, though is more common in dogs. Dogs at highest risk are those who routinely swim in stagnant bodies of water, rivers, lakes, and streams. Infection usually occurs when a mucous membrane or cut comes into contact with contaminated urine or water.

Leptospirosis causes a wide variety of symptoms, making it a difficult disease to diagnose as the signs vary widely. Fever, muscle tenderness, shivering, vomiting, changes in urination, jaundice, and kidney failure are just some of the signs seen. Because these signs are seen in many canine diseases, exposure history is often the main piece of information that causes a vet to suspect Lepto. Suspected cases must be handled carefully as dogs can infect humans.

2. Pythiosis

With a nickname like “swamp cancer,” you know it’s nothing good. Pythiosis is a rare but severe waterborne disease caused by a fungal-like organism called Pythium insidiosum. While more commonly known as a disease of plants, pythiosis can also infect animals—with terrible results.

The organism attaches itself to small wounds in the skin or gastrointestinal tract and grows into large, often ulcerated lesions. If it starts in the skin, owners will notice large red itchy lumps. If it takes root in the GI tract, owners will notice signs such as vomiting, diarrhea, and weight loss. The disease is most commonly diagnosed in Labradors, a breed known for their love of swimming. Because it is challenging to diagnose, pythiosis is often undiscovered until it is in an advanced stage. The organism is resistant to many treatments, and surgery is the treatment of choice.

3. Blue/Green Algae

Freshwater lakes and ponds are highly inviting to a water-loving dog, but beware of bodies of water with a dense buildup of blue-green algae. Under specific environmental conditions, most often during the summer months, photosynthetic bacteria can build up—a condition known as a blue-green algae harmful algal bloom (HAB). These algae can produce toxins with severe effects on pets and people.

Algal toxins come in a variety of forms and can affect any of the following systems: skin, GI tract, liver, and central nervous system. Depending on the type of toxin a pet is exposed to, symptoms can range from rashes, nausea and vomiting, respiratory failure, seizures, and death. Dogs should be kept from swimming in lakes with visible algal blooms as it is impossible to tell just by looking if the algae are producing toxins. Any illness after swimming in a lake with an algal bloom should be immediately reported to your veterinarian, as death can occur in severe cases.

4. Giardiasis

One of several microscopic parasites known to cause diarrhea in both dogs and humans, Giardia lamblia is an organism many dog owners are familiar with. Infected animals shed oocysts in their stool, which are hardy and can persist a long time in cool, moist environments, where they can then pass into water sources and back into a host.

Long known to be a cause of traveler’s diarrhea in humans, Giardia also causes a sudden onset of diarrhea in dogs. While both humans and dogs can be infected, it is not considered a major zoonotic disease as most human cases are caused by other humans, and is not normally passed from dogs to people. Although some dogs may experience severe dehydration and weight loss if infected for long periods, most cases of Giardia are mild and self-limiting. Symptomatic treatment and medications can hasten recovery in affected pets

5. Cryptosporidiosis

One of the nastier waterborne diseases, cryptosporidiosis is caused by the parasite Cryptosporidium. Both the parasite and the disease are often referred to as “crypto” by those unfortunate enough to have encountered it. Multiple species of Cryptosporidium exist in different animal species and some can cross-infect humans. The parasite is protected in the environment by a thick outer shell, which makes it able to survive the environment for a long time and even resist chlorine disinfectants.

It is one of the most common waterborne diseases linked to recreational water. Dogs are infected by ingesting the infective oocysts in contaminated food or water. Crypto causes watery diarrhea, which can lead to severe dehydration. Fortunately for dogs, most cases are mild or subclinical and are rarely life-threatening. Symptoms usually resolve within two weeks, with appropriate treatment.

6. Pseudomonas

Owners whose dogs are prone to ear infections can usually see it coming: the shaking head, the scratching at the ear canals, the stinky head. It is one of the most common reasons dogs are brought to the veterinary clinic. While otitis externa is a disease with multiple causes, such as bacteria, yeast, and underlying allergies, one of those causative agents can be found in the water.

Pseudomonas aeruginosa is the most common organism associated with chronic ear infections in dogs. It causes a smelly, oozy, purulent exudate and a substantial amount of painful swelling. Pseudomonas is frequently found in pools and is thought to be a common cause of “swimmer’s ear.” Pseudomonas is diagnosed by an exam and culture of the ear discharge by the veterinarian. If the infection is limited to the external ear canal, it is usually treated with flushes and appropriate topical treatments. Dogs with extra floppy ears that trap heat and moisture, and those who love to swim, are at highest risk.


Author Profile

Faith Courtney is a dog lover who can’t get enough of K9 love. She’s had dogs around her home since she was 8 years old. Many years on, she still keeps dogs around her home. Her family likes nothing more than to take the dogs out to the a dog park where they all can stretch their legs.



Well, the summer months are just around the corner (or here,depending on mother nature).  This is the time for trips to lakes and shore points.   Many of us are starting to bring our canine fur babies with the rest of the family to the water’s edge!    However,  pet parents need to  monitor their pets  for certain diseases that can be transmitted to dogs via water.  This article will teach what bodies of water can transmit disease to your  pups.

Make sure that you check the links on the right side of this page for great pricing on pet supplies and products.   Also note that Amazon and Walmart are sites that you can purchase anything that they sell..

Lovinmypup.com is also looking into restarting the program of featuring your  pets on line.  No decision has been made as to the location of this feature.  It may be on this site or on a seperate blog site.   More information will follow as decisions are made,  Keep coming back for more information and future updates.



  1. Todd

    Mloverso@rcn.com, thanks so much for the post.Really thank you! Keep writing.viagra cheap

    1. mloverso@rcn.com (Post author)

      You are very welcome! Our pups are our babies. We need to know the environmental dangers to their health and safety. Keep coming back. New posts daily.


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