Can a dog really sniff out the hidden invaders in your bedroom?

Nature · Published 29 September 2026 Swipe more like this →

In short: Bedbugs are notoriously difficult to track, hiding in furniture, behind wallpaper, and inside mattresses. While humans often only notice them after waking up with itchy, grouped bites, specialized canine detectors like Bernie are trained to sniff out these elusive pests, offering a high-tech solution to a persistent household problem.

Bedbugs are small, ranging in color from dark yellow to red or brown, and typically reach about 5mm in length. Their ability to remain undetected is aided by their tendency to hide in tight spaces, including bed frames, clothing, furniture, and even behind pictures or loose wallpaper. Because they are so adept at concealment and can be resistant to certain insecticides, professional pest control services are often required for effective removal. Attempting to eradicate an infestation independently is rarely successful, as these insects are not deterred by cleanliness; they thrive in both tidy and cluttered environments.

The primary evidence of an infestation often appears on the skin or bedding. Bites frequently occur in lines or clusters on exposed areas like the neck, face, and arms. On white skin, these bites appear red or pink, while on black or brown skin, they may manifest as brown, purple, or red marks. Other indicators include small blood spots on bedding from bites or crushed bugs, and tiny brown fecal spots left on furniture or linens. While bites generally resolve within a week, they can cause significant itching, swelling, or, in rare cases, severe allergic reactions.

Managing an infestation requires rigorous physical intervention. Experts recommend washing bedding and clothing at 60C and tumble drying on a hot setting for at least 30 minutes. Items that cannot be washed may be placed in a freezer for two to three weeks. To prevent future issues, it is advised to minimize clutter near the bed and exercise extreme caution when bringing secondhand furniture, luggage, or clothing into the home. If an infestation is suspected, contacting a local council or professional pest control service is the most reliable path to resolution, as these experts can navigate the challenges of detection and treatment that often baffle homeowners.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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