Yes, it’s possible. They can, but it’s unlikely. The CDC says the Giardia types that usually infect dogs and cats are not usually the same types that make people sick. Symptoms in people often start 1 to 2 weeks after swallowing Giardia and can last 2 to 6 weeks.
Can humans get giardia from dogs?
Yes, but the risk is low for most healthy adults.
Giardia is a microscopic parasite that spreads through poop. If an infected dog sheds Giardia cysts, anything touched by that poop can become contaminated: fur, paws, bedding, soil, bowls, your hands, and water at camp.
Here’s the key detail: the CDC says people are unlikely to get Giardia from dogs or cats because the type that makes people sick is usually not the same type that infects those pets. Low risk does not mean zero risk. If you clean up diarrhea, share a tent with a sick dog, skip handwashing, or let your dog lick your face after a messy trail day, you raise the odds.
For hikers, the bigger Giardia threat is usually untreated water from creeks, lakes, ponds, springs, and shallow wells—not your dog. Still, a sick dog on trail can contaminate campsites and water edges fast.
How does Giardia spread from dogs to people?
It spreads when Giardia from poop gets swallowed.
That sounds gross because it is. But the route can be tiny and invisible. You pick up dog waste, touch a leash, adjust your snack bag, then eat a bar with unwashed hands. Or your dog steps in contaminated mud, jumps into the tent, and later you touch the floor before cooking dinner.
Common trail and home routes include:
- Handling dog poop, diarrhea, or soiled bags
- Touching contaminated fur, paws, collars, crates, bedding, or bowls
- Letting a dog drink from or wade in contaminated water
- Drinking untreated backcountry water yourself
- Eating with dirty hands after cleaning up after your dog
- Letting a sick dog into shared dog parks, public trails, or water access points
The CDC also says Giardia can survive for several months in cold water or soil. Cool, wet places help it hang around; dry heat and direct sunlight are less friendly to it.
What are the symptoms of Giardia in humans?
Diarrhea is the most common symptom.
According to the CDC’s Giardia symptom guide, symptoms often begin 1 to 2 weeks after exposure. They can include diarrhea, gas, greasy floating stool, stomach cramps, nausea, fatigue, and dehydration. Some people have no symptoms at all.
| Possible sign | What you might notice | Trail concern |
|---|---|---|
| Diarrhea | Loose stool several times per day | Fast fluid loss on hot climbs |
| Gas and cramps | Bloating, sharp belly discomfort | Poor appetite and slow pace |
| Greasy stool | Smelly stool that may float | Possible nutrient absorption trouble |
| Dehydration | Thirst, dizziness, dark urine | Higher risk during long, dry stretches |
Symptoms typically last 2 to 6 weeks, but they can last longer, especially for people with weakened immune systems. Don’t try to “tough it out” through a multi-day hike if diarrhea is draining you. That’s how a manageable stomach bug turns into a bad evacuation problem.
What are the symptoms of Giardia in dogs?
Dogs may have diarrhea, vomiting, gas, stomach discomfort, or no signs at all.
Puppies and young dogs are more likely to get sick than adult dogs. A dog can also look normal and still shed Giardia in poop, which is one reason kennel, shelter, daycare, and dog-park settings can be messy for parasite control.
The Cornell University College of Veterinary Medicine notes that some infected dogs show no signs, while younger dogs and dogs with weakened immune systems are more likely to show clinical signs. If your dog has diarrhea that keeps going, call your veterinarian and ask whether stool testing makes sense.
Can you get Giardia from your dog licking you?
It’s possible, but a lick alone is not the usual problem.
The risk comes from contamination. If your dog has Giardia cysts on its mouth, beard, rear end, or paws after licking itself, eating poop, rolling in dirty soil, or drinking from a contaminated creek, then face licking is a bad idea.
Keep it simple on trail: no kisses from a dog with diarrhea, no licking around your mouth, and no dog tongue on your water bottle, cooking pot, spoon, or snack hand. Cute can wait.
How do you prevent Giardia when hiking with a dog?
Treat water, handle poop cleanly, and keep sick dogs away from shared water.
The CDC recommends boiling backcountry water for 1 minute, or 3 minutes above 6,500 feet [1,981 meters], to kill Giardia and other germs. Filtering can also help when the filter is certified for cyst or oocyst reduction, such as NSF Standards 53 or 58, but many filters that remove parasites do not remove viruses.
- Pack out dog poop. Use a bag, seal it, and keep it away from food and cookware.
- Clean your hands after every pickup. Soap and water are best when available. Hand sanitizer is useful, but it is not a magic shield against every trail germ.
- Do not let your dog poop near water. Move at least 200 feet [61 meters] from streams, lakes, and camp water sources when possible.
- Stop creek slurping. Offer treated water in a collapsible bowl instead of letting your dog drink from stagnant pools.
- Keep a diarrhea dog off public trails. If your dog is sick or being treated, choose yard rest over shared trail systems.
- Wash bowls and wipe paws. Muddy paws and shared bowls can move germs around camp.
- Separate clean and dirty gear. Keep poop bags, leashes, and paw towels away from your stove, food bag, and sleeping quilt.
How should you clean after a dog has Giardia?
Remove poop fast, wash what you can, and disinfect indoor pet items.
At home, clean bowls, crates, bedding, toys, and floors your dog uses. The CDC advises cleaning and disinfecting pet items daily if a dog or cat is taking medication for Giardia, continuing until a few days after the last dose. Bathing your dog can also remove poop from fur.
Use this cleanup checklist:
- Wear disposable gloves when handling diarrhea or heavily soiled bedding.
- Pick up poop promptly and throw it away in a sealed bag.
- Wash hands after touching pets, poop, bowls, bedding, crates, or soil.
- Launder washable bedding and towels.
- Clean pet items outside when possible; if you use a bathtub or laundry sink, clean that area afterward.
- Do not use bleach or disinfectants on soil or grass; the CDC says these products will not kill Giardia in soil or grass.
When to see a doctor
See a healthcare provider if you have diarrhea or symptoms that fit Giardia after possible exposure.
The CDC says a provider may ask for one or more stool samples because Giardia is not always found in every sample. If you have diarrhea, drink fluids to reduce the risk of dehydration, and ask a clinician what treatment options fit your health history.
Get medical help sooner if you have signs of dehydration, blood in stool, severe belly pain, symptoms that keep returning, diarrhea after backcountry water exposure, or a weakened immune system. Infants and pregnant people face higher dehydration risk from diarrhea, so they should not wait it out.
Related reading
- How Do Dogs Get Giardia on Hikes?
- Can Dogs Get Poison Ivy?
- Can Dogs Get Altitude Sickness?
- How to Get Rid of a Poison Ivy Rash Fast
FAQ
Can I sleep in the same tent as a dog with Giardia?
Yes, but it is not a great plan if the dog has diarrhea. If you must share space, keep the dog off sleeping bags, wipe paws and rear fur, bag waste fast, and wash your hands before touching food or your face.
Can my dog give Giardia to another dog?
Yes. Dogs can spread Giardia to other dogs through contaminated poop, soil, water, fur, crates, bowls, and shared play areas. Keep a sick or treated dog away from dog parks, kennels, daycares, and public trails until your vet says it is safe.
Can Giardia go away on its own in people?
Yes, some people recover without medication. Still, the CDC recommends talking with a healthcare provider if you have diarrhea or other Giardia-like symptoms, because testing and treatment depend on your situation.
Does boiling water kill Giardia?
Yes. The CDC says boiling water for 1 minute kills Giardia; above 6,500 feet [1,981 meters], boil for 3 minutes. This is one of the most reliable backcountry water steps when fuel and time allow.
Should I cancel a hike if my dog has Giardia?
Yes, if your dog has diarrhea or is being treated. Trail time can wait, and keeping your dog home helps protect other dogs, wildlife, water sources, and hikers who use the same route.