Degus are tidy inside the cage and chaotic just outside it. Hay works its way through the bars, dust from bathing drifts and settles, and water bottles drip exactly where they please, so the carpet beneath a degu cage ages years faster than the rest of the room unless something deliberate stands between the cage and the floor.
The Rigid Waterproof Base Layer
Start with a rigid waterproof sheet, in clear chair-mat material or a sheet-vinyl offcut, cut larger than the cage footprint. Larger is the point: drips roll, hay scatters, and dust travels, so the sheet should extend well beyond the cage on every side, especially beneath the door and the bottle side, where most mess escapes. Rigid matters too, because a stiff sheet lies flat, resists chewing investigation at the edges better than a floppy cover, and lets the cage sit steady without rocking. Wipe it down in place during the week and nothing wet or dusty ever reaches the carpet fibers below it.
Measure the cage, add a generous margin all around, and cut once rather than piecing offcuts together, since seams are where liquid sneaks through. If the cage stands on casters or feet, confirm the sheet still covers the full scatter zone when the door swings open and a keeper kneels to clean, because that open-door footprint is the real working area.
The Washable Catch Layer
Top the sheet, if you like, with a washable low-pile mat that catches hay and dust for shaking outside. Low pile is the practical choice: hay releases from it with a shake instead of clinging the way it does to deep carpet, and the mat can go through a wash when a shake stops being enough. This top layer is the sacrificial one, taking the daily scuff, the dust-bath overflow, and the tracked bedding, while the rigid sheet underneath stays as the true waterproof barrier. Shake the mat outside every few days, before the debris load gets ground down into it by passing feet.
Daily habits decide whether the layers succeed. Sweep or vacuum the surround often, because degu mess migrates across a room on socks and slippers, and keep bottles and hay racks positioned over the protected zone rather than at an unprotected edge.
Lifting, Checking, and Replacing
Once a week the whole arrangement comes up briefly, so the carpet, the sheet, and the mat each get inspected in turn.
Lift the layers weekly to check nothing damp is trapped against the carpet, because a waterproof sheet protects in both directions and a spill that creeps underneath can sit wet and unseen. Let the carpet dry fully before relaying anything if you do find moisture, and inspect the sheet for cracks or curled edges that would let the next drip through. Replace the mat when washing stops reviving it, and replace the sheet when it crazes or splits, treating both as consumables in a long degu life rather than as permanent fittings. In a home where several people sweep, shake, and lift on different days, recording the weekly check in a place the whole household reads keeps the chore from being assumed done, and that shared visibility is what Family Sharing offers through KinsLe for degu households.