A bed bug inspection means checking where they hide. Use a bright flashlight and a plastic card to run through the mattress seams, then work outward to the box spring, frame, headboard, and baseboards. Look for live bugs, dark fecal spots, pale shed skins, and tiny eggs.
A good bed bug inspection is methodical, not frantic. Bed bugs are easy to miss because they wedge into tight seams and cracks close to where you sleep, and the early signs are small. The good news: an adult bed bug is reddish-brown and about 5 to 7 millimeters long, so it is visible to the naked eye if you know where and how to look.
Throughout this guide we use one simple idea: The Bedside-Out Sweep — start your inspection right at the mattress and work outward in rings, because bed bugs almost always hide within a few feet of the sleeping spot. If you are still unsure what you are looking at, see what do bed bugs look like and whether you can see bed bugs on the bed.
Run the card along the mattress piping and seams to flush hidden bugs into view, and shine the light into every fold and crack. You are hunting for four things: live bugs, dark ink-like fecal spots, pale empty shed skins, and tiny white eggs about 1 millimeter across. For help telling the droppings apart, see bed bug poop, and for the subtler clues, early signs of bed bugs.
A bed bug detector is a tool that catches or lures bugs so you can confirm an infestation between hands-on inspections. There are two broad types, and they work in very different ways.
Passive interceptors are shallow cups that sit under each bed leg. Bugs trying to climb up to feed — or back down afterward — fall into the smooth-walled pitfall and cannot escape, so you simply check the cups. Active monitors go a step further: they emit attractants such as carbon dioxide, warmth, or a chemical lure to draw nearby bugs in, mimicking a sleeping person.
Both have limits. An interceptor only catches a bug that actually crosses it, and an active monitor only pulls in bugs that are close and hungry. Because bed bugs can survive months without a meal, leave any detector in place and re-check it over several weeks before deciding the bed is clear. Treat a detector as a supplement to a visual sweep, not a replacement for one.
Bed bug sniffing dogs are detection dogs trained to find live bugs and viable eggs by scent, often faster than a person can search a room. A trained dog works the edges of the bed, furniture, and baseboards and signals when it catches the odor.
Their value is speed and reach: a dog can flag a hiding spot a visual check might miss. The catch is reliability. In controlled tests, well-trained dogs are very accurate, but in real-world field conditions accuracy depends heavily on the quality of the training and the handler. A dog can alert to a spot where bugs were but no longer are, or react to a handler's cues.
For that reason, a dog's alert should always be confirmed with a visual inspection of the flagged area before acting on it. A scent alert tells you where to look closely — it is a starting point, not final proof. If a confirmed problem turns out to be widespread, that is the point to consider a bed bug exterminator or a full plan to get rid of bed bugs.
Bed bugs are slow, patient, and good at hiding, so a single clean look does not prove they are gone. Keep these facts in mind:
Re-check the hotspots and leave interceptors in place before you conclude there is no problem.