Guinea pigs were never great climbers, and age turns even a modest ramp into a negotiation. The kindest senior layout is flat and predictable: every necessity on one level, step-overs reduced to almost nothing, and deep, soft resting spots that arthritic joints can sink into. Keep the flooring solid and dry underfoot, leave hides in their established places so the map stays familiar, and look at the pen through your guinea pig's eyes each week — a route that was fine in summer can defeat a stiffer animal by winter.
Ramps: Gentler, or Gone
If a second level exists, either retire it or reach it by a long, shallow ramp with a solid, high-grip surface and sides that prevent a sideways slip. Most elderly guinea pigs do better with the space redistributed horizontally instead. Litter and hay areas need an entry lip low enough to step over without rocking onto sore feet — cut-down tray sides or a ramped threshold both work — because an animal who finds the hay tray awkward will eat less hay, and hay is the food this species can least afford to skip.
Fleece, Hides and Warm Resting Places
Layer fleece over absorbent padding in the resting zones and wash the layers often, since damp fleece against an older, less mobile body quickly sours skin. Provide more than one hide, each with a wide, low entrance, placed so your guinea pig can move between shelter, hay and water in a few steps. A hide that requires a hop up, however small, will slowly be abandoned.
What to Track Week by Week
- Which hides are used, and whether any have been given up
- Ease of stepping into the hay and litter area
- Hay intake and enthusiasm at vegetable time
- Weekly weight, taken at the same time of day
- Squeaking, stiffness or reluctance when moving or being lifted
Rest is diagnostic too: a senior guinea pig who can settle fully on one side, legs tucked and breathing easy, is telling you the fleece depth and hide placement are right.
Weight loss, a guinea pig who stops eating hay, or squeaking when urinating or moving belongs in a veterinary conversation promptly; guinea pigs decline quickly once appetite goes. Note which layout change preceded any improvement, because that tells you where the difficulty really was.
On vet days or when a sitter takes over, the records for this guinea pig travel in its Pet Passport via KinsLe, complete with weights, dates and notes in a single packet.