When Sewage Makes Dogs Sick

When Sewage Makes Dogs Sick: This Isn’t a One-Off

Last week in Lyndhurst, I spoke to a woman whose dog had become seriously ill after exposure to sewage-contaminated ground. The vet told her that the dog had an E. coli infection. She didn’t need convincing that sewage pollution matters - she’s living with the consequences. She was, quite simply, deeply grateful that someone is paying attention.

And she is not alone. We are hearing more and more stories like this. We have already hosted one woman’s story on this Website blog.

Is E. coli to blame?

When people think of sewage, they think of E. coli. And that’s certainly what we’ve been testing for.

It’s true that Escherichia coli is often to blame. It’s found in faeces and is used to indicate sewage contamination. But here’s the key point:  E. coli is often a warning sign, not the main cause of illness.

Some strains can make dogs ill (causing diarrhoea, vomiting, and in rare cases more serious disease), but in environmental exposure cases like this, it’s often part of a much bigger and more dangerous mix.

What’s really in sewage?

Sewage isn’t one thing: it’s a complex cocktail of biological and chemical hazards.  There are many but a few high-risk culprits include:

Bacteria

• Leptospira  can cause kidney/liver failure; potentially fatal

• Salmonella, Campylobacter can lead to severe gastrointestinal illness

Parasites

• Giardia can give prolonged diarrhoea

• Worm eggs result in long-lived contamination in soil

Toxins

• Cyanobacterial (blue-green algae) toxins can lead to rapid collapse, seizures, death

• Ammonia, nitrates, detergents can lead to irritation and toxicity

And don’t forget the microplastics & pharmaceuticals.

Why dogs are so vulnerable

Dogs don’t just walk through contamination—they ingest it by licking paws and fur, sniffing and mouthing grass and drinking from puddles. This means even a brief exposure can deliver a significant dose.

In cases like the one in Lyndhurst, the most honest answer to the question, “What made this dog ill?”is that it’s rarely just one thing, although the vet said it was an E. coli infection.

Illness is likely caused by multiple pathogens acting together, possibly combined with chemical exposure. E. coli may be present, and it certainly was here, but it’s only one piece of the puzzle.

Why this matters

This isn’t abstract. This is: dogs becoming acutely ill,

owners facing emergency vet visits and communities losing confidence in the safety of their environment.

And these encounters are increasingly common.

A simple message

Sewage pollution is not just an environmental issue.  It’s an animal welfare issue, a public health issue and a community issue.  The science is clear: where sewage goes, risk follows.

What can dog owners do?

• Wash dogs after suspected exposure

• Prevent licking before cleaning

• Watch for symptoms over several days

• Seek urgent veterinary care if unwell

And ensure leptospirosis vaccination is up to date.

Final thought

That conversation in Lyndhurst wasn’t unusual and that’s the problem. Until sewage pollution is taken seriously, we will keep hearing these stories

from dog owners, from families, from people who simply expected their local environment to be safe.

And they deserve better.