Protect the Bond, Adjust the Home
The instinct to move the frailer pig somewhere 'easier to manage' is understandable and usually wrong: a bonded guinea pig draws comfort, warmth and confidence from her companion, and separation adds grief to the work of ageing. Instead, change the home they share. Everything the elder pig needs should exist at floor level, because ramps and raised platforms quietly drop out of her world first. Deepen the bedding in the corner she already favours so resting is soft on ageing joints, and make sure the hides have entrances she can walk through rather than hop over. Her companion keeps the run of the whole enclosure; the elder gets a version of the same home that asks less of her, without losing the pig she sleeps against.
Feeding Two Pigs at Two Speeds
Diverging appetites are where an uneven pair drifts into trouble, because the stronger pig will calmly eat both shares. Put hay in two generous floor-level piles at opposite ends of the enclosure, so the elder is never out-waited at a single pile, and scatter their vegetables in two small clusters rather than one contested heap. Feed any extra supportive foods your vet has suggested for the elder during a short lap session, where you can watch her eat her fill undisturbed and enjoy the handling besides. Watch mealtimes for a week or two after you notice the gap widening: a younger companion who starts guarding doorways or shoving at the hay is telling you the layout, not the friendship, needs another adjustment.
Weigh-Ins Tell the Story Early
Guinea pigs hide decline behind fluff and routine, but a kitchen scale does not lie. Weigh both pigs on the same day each week, in the same bowl, and write the numbers down. The elder's line is the one that matters most: a slow, steady drift downward is appetite loss announcing itself weeks before you would see it, and it is one of the most useful things you can hand a vet. The companion's weight matters too — a gain can mean she is quietly eating for two. Note appetite, droppings and how much the elder moves alongside the weights, and the pair's diverging paths become a clear written record instead of a vague feeling that she seems 'a bit less herself'.
Plan Gently for the Harder Part
Supporting the elder well means thinking, kindly and early, about two futures. The first is hers: contact your vet if her weight drops steadily, she stops coming out for food, her breathing looks effortful or she loses interest in her companion — those are the points where comfort needs professional help, not just softer bedding. The second is her bondmate's: when the elder eventually dies, the survivor will need company, comfort and often a new companion in time, and knowing that now is part of caring for both. Storing each pig's weight record, vet notes and history in her own KinsLe Pet Passport keeps their two stories separate and clear, so every decision for the ageing pig is made on her own facts, not on the pair's average.