The short answer
What Sewage Fumes Contain
Sewage fumes come from decomposing waste, and they carry a mix of gases that are harsh on living tissue. Hydrogen sulfide gives that rotten egg smell and can irritate the eyes, nose, and throat. Ammonia and methane are also common, and in a closed space these gases build up quickly.
Your dog's sense of smell is far stronger than yours, so the same air can be more overwhelming for them. Even low levels of these gases can trigger coughing, sneezing, or watery eyes in a pet. The risk goes up in small rooms, basements, or anywhere air does not move much.
How Fumes Affect a Dog's Health
Short-term exposure to sewage fumes often causes mild irritation, like a runny nose, drooling, or a bout of nausea. In worse cases, a dog may vomit, have diarrhea, or show signs of breathing trouble, such as panting or wheezing. Puppies, older dogs, and breeds with flat faces are more sensitive to poor air.
Long-term exposure is more serious. Breathing in these gases day after day can damage a dog's lungs or worsen existing heart conditions. If your dog seems tired, has no appetite, or acts confused, that could point to a reaction to the fumes. A veterinarian can tell you if the symptoms are from the air or something else.
- Move your dog to fresh air right away
- Watch for coughing, vomiting, or heavy panting
- Check that your dog has water to drink
- Keep your dog away from the affected area until it is cleaned
- See a vet if symptoms last more than a few hours
What Causes the Fumes
Sewage fumes usually mean there is a leak or a backup somewhere in your plumbing. A cracked pipe, a clogged drain, or a broken wax ring on a toilet can let waste gases escape into your living space. Sometimes the source is outside, like a damaged sewer line under your yard.
The smell is the first clue, but you may not always see the problem. If you notice a persistent odor, check your drains, toilets, and the area around your water heater. A plumber can locate the leak, and if the issue involves a sewage backup, local water damage pros can handle the cleanup and sanitation.
Steps to Protect Your Dog
The right thing you can do is keep your dog away from the area until the problem is fixed. Open windows and use fans to pull fresh air in, but do not let your dog into the room until the odor is gone. If the smell is strong, consider having a professional test the air quality.
After any sewage cleanup, make sure the space is thoroughly dried and disinfected. Porous materials like drywall and carpet can hold onto bacteria and odors, so they may need to be removed. The pros who do sewage backup cleanup can advise on what is safe to keep and what should go.
When to See a Vet
If your dog has been around sewage fumes and starts coughing, vomiting, or acting weak, call a veterinarian right away. These signs can also come from other things, so a vet's exam is the only way to know for sure. Do not give your dog any medicine without a vet's advice.
In rare cases, severe exposure to hydrogen sulfide can cause collapse or seizures. That is an emergency, and you should get your dog to a clinic immediately. Tell the vet about the sewage exposure so they can look for the right symptoms.
Need help right now?
Phones are answered 24/7 for Redmond and nearby communities.
Call Now (425) 407-5186Frequently asked questions
How long do sewage fumes stay in a house?
It depends on the source and how much air moves through. A small leak may leave a smell for hours, while a big backup can linger for days. Until the leak is fixed and the area is cleaned and dried, the odor can keep coming back.
Can sewage fumes harm people too?
Yes, the same gases can irritate human lungs, eyes, and skin. Children, older adults, and people with asthma are more sensitive. If you feel dizzy, nauseous, or have trouble breathing, get to fresh air and see a doctor if symptoms do not clear.
What should I do if I smell sewage in my home?
Leave the area and take your dog with you. Open windows to air out the space, and check for obvious clogs or leaks. If you cannot find the source, call a plumber or a water damage pro to inspect. Do not ignore the smell, as it can get worse.