Is mould harmful to children or pets?

Most people know mould is unpleasant, it looks bad, smells musty, and spreads if left untreated. But when it comes to children and pets, the concerns go beyond cosmetic.

In this blog, we’ll answer a critical question: Is mould harmful to children or pets?
The short answer? Yes. And in many cases, far more than adults.

Let’s explore how mould affects young children and animals, the warning signs to watch for, and how you can keep your family safe.

Why mould is a bigger risk for children and pets
While mould can impact anyone, babies, toddlers, and pets are much more sensitive to mould spores because:

• Their lungs and immune systems are still developing
• They spend more time close to the ground, where spores settle
• They’re often in enclosed indoor spaces for long periods (especially during colder months)

Even low levels of mould exposure can trigger issues in vulnerable groups far sooner than in healthy adults.

Common health effects of mould in children
When children are exposed to mould, especially black mould (Stachybotrys chartarum), the effects can range from mild irritation to more serious long-term health problems.

Respiratory issues

• Wheezing
• Persistent coughing
• Shortness of breath
• Worsening asthma symptoms

Allergic Reactions

• Sneezing
• Runny nose
• Red or itchy eyes
• Skin rashes or eczema flare-ups

Cognitive or Behavioural Symptoms

• Some studies suggest a link between prolonged mould exposure and fatigue, poor concentration, or headaches in children.

Serious risks
In extreme cases, exposure to toxic moulds can contribute to lung infections or trigger serious allergic reactions in children with underlying health conditions.

How mould affects pets
Just like humans, pets can inhale or ingest mould spores. But because they can’t tell us how they’re feeling, it’s even more important to spot the signs early.

Common symptoms in dogs and cats:

• Laboured breathing or wheezing
• Lethargy or unusual behaviour
• Loss of appetite
• Vomiting or diarrhoea (especially if they’ve licked mouldy surfaces or eaten mouldy food)
• Skin irritation or hair loss
• Birds and small mammals (like rabbits or hamsters) are particularly sensitive to poor air quality, making mould even more dangerous for them.

Where mould hides, and why it matters
It’s not always obvious where mould is growing. Pets and children are more likely to come into contact with hidden patches of mould that adults might miss.

Common hiding spots:

• Under carpets or rugs
• Behind furniture
• Around windowsills
• Inside cupboards or wardrobes
• On soft toys, pet bedding or clothing stored in damp areas

Mould can also circulate through your home via air vents and heating systems, meaning spores may be present even if you can’t see obvious signs.

How to protect children and pets from mould
Prevention is always better than cure. If you’re concerned about the health of your family, furry members included, take the following steps:

Control humidity
Keep indoor humidity below 60% using extractor fans or a dehumidifier, especially in bathrooms and kitchens.

Ventilate properly
Open windows daily, and ensure air can flow freely throughout the home. Avoid drying clothes indoors if possible.

Check for condensation
Wipe down windows and cold surfaces regularly, and be alert to damp smells or spots.

Clean and inspect regularly
Keep an eye on soft furnishings, children’s toys, and pet bedding, these absorb moisture easily and can harbour mould.

Act fast
If you see mould, don’t ignore it. Small patches can turn into big problems quickly, especially in homes with pets or children.

When to call a professional
If mould keeps coming back, even after cleaning, or you’re worried about health symptoms, it’s time to get a proper inspection. At Dwelling Doctors, we use advanced equipment to detect hidden mould and treat the root cause, not just the surface.

We’ve helped hundreds of families create safer, healthier homes, and we’re here to help you too.

Article Author

Scott Evans

Scott Evans is the founder and CEO of Dwelling Doctors