Many dogs love drinking from puddles, creeks, lakes, and ponds while they’re out exploring. Unfortunately, even water that looks crystal clear can contain bacteria, parasites, harmful algae, or other contaminants that can make your dog seriously ill.
I learned this lesson the hard way with Henry. On the day I adopted him, I let him drink from what looked like a clean mountain creek. A day later he was diagnosed with Giardia.
Since then, I always carry fresh water wherever we go. In this guide, you’ll learn the biggest dirty water risks for dogs, what illnesses they can cause, warning signs to watch for, and simple ways to protect your pup while still enjoying outdoor adventures.
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Budget Tip:
Here's the amazing thing with dirty water risks for dogs. You may not only be saving your dog from being sick, but also saving your dog's life. While it doesn't take a lot of effort to avoid dirty water, it can be a game-changer. Of course, you also get to avoid pricey emergency vet bills in the process. This is all a huge win-win for you and your pup.
What Counts as Dirty Water for Dogs?
Simply put, dirty water is water that you wouldn’t drink. It may look clean, but you or your dog could get sick if you drank the water. You can find dirty water risks for dogs in the following forms:
- Mud puddle
- Pond water
- Rain puddle
- Lake
- Creek
- River
Dirty water could be standing or flowing water. You may not be able to tell visually or even by smell that the water is dirty.
Quick Answer: If you wouldn’t confidently drink the water yourself, or you don’t know whether it’s clean, don’t let your dog drink it either. Always bring fresh water and a folding travel bowl on walks, hikes, and trips to the park.
Discover how to keep your dog safe around water in this article.
What Makes Dirty Water Dangerous for Dogs?
This will naturally vary from location to location. But some of the most common unsafe water sources with dirty water risks for dogs are:
- Blue Green Algae
- Parasites
- Bacteria
- Sewage
- Salt
Can Dogs Drink From Lakes, Ponds, Rivers, or Creeks?
It will depend. When in doubt, have your dog drink from clean water you have with you. Consider the following unsafe water sources for your dog.
| Water source | Safe? |
|---|---|
| Rain puddle | Usually no |
| Pond | Avoid |
| Creek | Avoid drinking |
| River | Avoid |
| Lake | Avoid |
| Ocean | Avoid swallowing |
Henry’s Lesson: On the day I adopted Henry, I let him drink from what looked like a perfectly clean mountain creek. He developed Giardia and needed antibiotics. Our veterinarian told me to always bring fresh water instead because even clear water can carry parasites and bacteria.
5 Illnesses Dogs Can Get From Dirty Water
You may be shocked to learn that your dog can get sick from water that even looks clean. Also, the water may even be flowing. However, it can make your dog sick just by drinking or playing in it. Here are the top five culprits of waterborne illnesses in dogs.
1. Blue Green Algae Poisoning in Dogs
This type of dangerous water will appear very green on top. It will almost look like paint has been poured on top of the standing water. It could even have a green oil slick appearance. Any water that looks like this, you and your dog will want to avoid. Even if there are no signs prohibiting it, don’t swim, fish, or allow your dog to drink or enter this type of blue algae water.
However, if your dog does come in contact with blue green algae contaminated water, you’ll need to act quickly to get him or her to your vet.
How to avoid blue green algae
This waterborne illness in dogs is one of the easier ones to avoid since the water presents a blue green oil spill appearance. If you see a waterway that has this appearance, avoid it.
Symptoms of blue green poisoning in dogs include:
- Panting
- Vomiting
- Seizures
- Drooling
- Diarrhea
Blue green algae poisoning may also include liver and respiratory failure as well as death. Thus, the need to act quickly and avoid blue green algae water at all costs with your dog.
NOTE: At Henry’s favorite hiking spot, there are signs up currently that the lake is toxic due to blue green algae. However, don’t expect signs in all locations. Especially as the drought in the west continues, blue green algae will become more prevalent.
2. Giardia in Dogs
This is a microscopic parasite that you won’t be able to see or smell. Giardia is found in water that has been contaminated with feces. This can be human or animal feces.
Also, the water can be standing or flowing. Thus, a creek could be soiled with wild animal feces. Or it could be soiled by dogs eliminating too close to the creek. This is a very good case for always picking up your dog’s poo and not allowing your dog to defecate close to waterways.
How to avoid Giardia
Since Giardia isn’t easy to detect, the best idea is to avoid waterways you don’t know. The good thing about Giardia is that it’s not fatal, but it can make your dog sick.
Symptoms of Giardia in dogs include:
- Diarrhea
- Vomiting
- Diminished appetite
- Lethargy
If your dog is exhibiting any of these conditions, you’ll want to seek veterinary care for a proper diagnosis and treatment.
Wish you could hike with your dog without back pain? In this article, I show you how to do it.
3. Cryptosporidium in Dogs
This is another parasite that is found in infected water as well as food and feces. Again, you will not be able to tell the water is dirty simply by a visual inspection for cryptosporidium. You probably won’t be able to smell that it’s dirty water either. These parasites are microscopic.
How to avoid Cryptosporidium
Since it’s difficult to tell if water is contaminated with this parasite, the best option is to avoid waterways and give your dog only water you know is safe.
Symptoms of cryptosporidium in dogs include:
- Diarrhea
- Fever
- Lethargy
- Weakness
- Diminished appetite
The good news is that if your furry friend is in good “dog health,” he or she may not need any treatment for this parasite. However, if your dog is a puppy, senior, or has immune issues, he or she will probably need treatment.
You’ll want to consult your veterinarian either way. Also, this is another good reason to not only let your dog drink solely from water you provide, but also not to eat feces. I know that can be a tough one for some dogs, but one worth working on with your dog.
4. Leptospirosis (Lepto) in Dogs
This is a bacterium that resides in rivers, creeks, streams, and lakes worldwide. It’s considered a zoonotic disease, which simply means it can be passed from animal to human. While this harmful bacteria is most common in areas that are warmer and have a lot of rain, it can occur anywhere.
How to avoid Lepto
Lepto is passed through urine-infected water, soil, food, or bedding. Again, you may not be able to tell that a stream is soiled with leptospirosis until your dog is sick. Thus, it’s best to avoid letting your dog drink from waterways.
Symptoms of leptospirosis in dogs include:
The symptoms of lepto can vary in dogs. While some dogs will be very sick. Others will have extremely mild symptoms and recover quickly. However, if you suspect your dog has been exposed to lepto you’ll want to consult your veterinarian immediately. Here are some symptoms that could appear if your dog has been infected with leptospirosis:
- Frequent urinating
- Dehydration
- Vomiting
- Diarrhea
- Diminished appetite
- Lethargy
- Inflammation of the eyes
- Jaundice (yellowing) of skin and mucous membranes
Also, this bacterium can cause kidney and liver failure or problems.
NOTE: If your dog is at high risk for exposure to Leptospirosis, you may want to consult with your veterinarian about the vaccine for leptospirosis. This vaccine has been associated with allergy issues. However, those issues may be better than the possibility of lepto. It will be something to discuss with your veterinarian.
5. Hypernatremia in dogs
This is basically excess saltwater ingested by your dog that puts his or her system in a state of imbalance.
While it can be fun to play with your dog at the ocean or some other saltwater body, keep in mind the risks. A little ingestion of saltwater will cause diarrhea. However, your main concern will be when enough saltwater is ingested that more serious symptoms occur.
How to avoid Hypernatremia
Generally, when playing with your dog in saltwater, it’s recommended that you make your dog take a break every 15 minutes and drink clean water. You may need to squirt the clean water into your dog’s mouth to encourage drinking. However, this is thought to prevent the more serious symptoms of hypernatremia.
Symptoms of Hypernatremia in dogs include:
- Diarrhea
- Vomiting
- Dehydration
- Seizures
If your dog has these symptoms of hypernatremia, you’ll want to seek veterinary care immediately.
Other Dirty Water Risks Dog Parents Often Forget
Any stagnant water could be a breeding ground for a bacterial infection.
- Communal water bowls
- Puddles in parking lots, or anywhere else
- Flooded fields
- Runoff after heavy rain
- Standing bird baths
Don’t forget to always pack a folding or travel dog water bowl for walks, hikes, and other adventures.
How Much Money Can You Save by Avoiding Dirty Water?
You may not think that simply avoiding contaminated water could impact your bottom line, but it definitely can be huge! Consider the following for a moment.
| Issue | Possible Cost |
| Emergency vet | $100 – 5,000 |
| Antibotics | $25 – 50 |
| IV fluids | $100 – 200 |
| Bloodwork | $100 – 300 |
| Hospitalization | $500 – 2,000 |
| Fatal contamination | Heartbreaking!!! |
| Healthy dog | Priceless!!! |
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- Dog Water Safety Tips
- How to Enjoy Dog Hiking Trails Without Back Pain
- Easy Dog Emergency Vet Visits Tips
- How to Find the Best Veterinarian
- Dog Toilet Drinking Harmful? Or Completely Gross?
- Happy Dog Hiking Trails Without Back Pain
- Easy Hack To Remove Sap From Your Dog’s Fur
FAQs about Dogs Drinking Dirty Water
Can dogs drink creek water?
No, dirty water risks for dogs can be in creek water. Even clear flowing water may be contaminated water and contain Giardia, Leptospira, or other harmful organisms.
Can dogs drink lake water?
Avoid it whenever possible because lakes may contain harmful algae, parasites, or bacteria.
Is puddle water dangerous for dogs?
Yes. Puddles can contain bacteria, chemicals, antifreeze residue, parasites, or runoff.
How do I know if my dog got sick from dirty water?
You’ll want to watch for these symptoms:
- Diarrhea
- Fever
- Lethargy
- Weakness
- Diminished appetite
Should I bring water on every walk?
Yes. Bringing fresh water is the safest option. Also, remember that your dog will need a folding bowl like this one.
Dirty Water Risks For Dogs To Avoid
Dirty water isn’t always dirty-looking. Some of the most dangerous bacteria, parasites, and algae are completely invisible, which makes prevention the safest choice.
After Henry’s Giardia diagnosis, I never leave home without fresh water and a collapsible travel bowl. It’s a simple habit that helps us enjoy hiking and outdoor adventures without worrying about what might be hiding in a puddle, creek, or lake.
A little planning today can save your dog from serious illness and save you from an expensive emergency vet visit later.
