Prepare a finished home before collection day
Set up the pen completely before you collect a senior rabbit or guinea pig: bedding in, hay piled, water offered both ways it might prefer, a hide with bedding that can be kept if the rescue allows a familiar-smelling item to travel. Older animals cope poorly with being placed in a bare box while someone builds furniture around them. A finished, quiet pen in a low-traffic room lets the first hours be about sniffing, eating, and hiding rather than noise and movement.
Ask detailed questions while you are still at the rescue. What hay and pellets does it eat, and how much? Is it used to a bottle or a bowl? Does it have known dental trouble, arthritis, or medication routines, when was it last seen by a veterinarian, and how does it behave with handling? Write the answers down on the day, because settling decisions in the first week all depend on that starting point.
Keep the first days deliberately boring
Resist introductions, tours of the house, and well-meant cuddles. Sit near the pen, talk quietly, offer food by hand without pulling the animal out, and let it choose when to emerge from its hide. A senior guinea pig may freeze and stay hidden for long stretches; a senior rabbit may thump or turn its back. Both responses are information about pace, not rejection of you.
Feed exactly what it is used to, in the amounts it is used to, for at least the first several days. Sudden food changes upset the gut of rabbits and guinea pigs at any age, and an older gut with worn teeth has less margin. If you plan to improve the diet, transition gradually once appetite, droppings, and weight are stable, and keep hay constantly available from the first hour, because hay intake is the clearest early sign that a prey animal feels safe enough to eat.
Learn its normal before you judge its progress
Weigh your new arrival in the first day or two, note how much hay and water disappear overnight, and watch how it moves: can it reach its tray or toilet corner, groom its underside, and get in and out of its hide comfortably? Senior animals often arrive with stiff joints, long nails, or dental wear that a rescue has already flagged, and your job in week one is to establish a baseline rather than fix everything at once.
Book a check with a veterinarian experienced with rabbits or guinea pigs within the first couple of weeks, sooner if it stops eating, has runny droppings, breathes noisily, or cannot move to food. Bring the rescue's records and your own notes on appetite and droppings, because that combined picture is far more useful than memory alone at a first appointment.
Bonding and introductions come later, if at all
If you already have a rabbit or guinea pig, do not place a senior newcomer straight in with it, however lonely each seems. House them side by side where they can see and smell each other safely, and seek rescue guidance on whether bonding is wise for an animal of this age and health. Some seniors thrive with a calm companion, others are happiest as a single pet with human company, and a failed rushed introduction can injure a fragile animal.
As the weeks pass and trust builds, KinsLe's Transferrable Profiles mean the profile the rescue started for this rabbit or guinea pig can transfer to you with its history, records and routines intact, so its age, quirks and care needs stay documented in one place as it settles into its new home.