Start the Californian in One Finished Pen, Not the Whole House
A Californian rabbit settles fastest when her first territory is small, complete and already set up before the carrier opens. Place the pen in a quiet room away from television speakers, barking and through-traffic, then open the carrier inside it and step back. This large breed will usually freeze, sniff the corners in short hops, and retreat to a hide box several times before eating, and that looping exploration is how she learns the pen is safe. Resist lifting her out for a tour, because being carried through unfamiliar rooms adds height, motion and new smells before she has a base to return to.
Build the Californian's Pen Around Weight, Hay and Shade
A Californian's pen needs a solid, non-slip floor that supports a heavy rabbit without flexing, plus room to stretch fully and take three full hops. Fill a low litter box with paper-based litter topped with hay, set a heavy ceramic water bowl where it cannot be tipped by a shoulder, and add a grass hay rack she can pull from all day. Those dark points on her ears and nose deepen with cool conditions and fade in heat, so keep the pen out of direct sun and away from radiators rather than judging her comfort by the room alone. A cardboard hide with two exits lets her rest unseen without being cornered in a dead end.
Let the First Two Days Run on Her Previous Food and Routine
A Californian who stops eating is a concern, so keep the exact hay and pellets from the rescue or breeder for the first week and change nothing suddenly. Scatter a small handful of her familiar pellets near the hide on the first night instead of presenting a bowl of new greens, which can upset a stressed gut. Check the litter box each morning for normal droppings and refill hay before it runs low, since steady nibbling tells you she is settling. Speak in the same low voice at the same feeding times, and let children watch from outside the pen until she eats comfortably with people nearby.
Handle a Californian by Invitation, With Full Body Support
Californians are often described as calm, but a newly adopted one can kick hard if she is scooped up without warning. Sit on the floor inside an expanded pen area on day three or four, let her circle your legs, and stroke her forehead only while all four feet stay on the ground. When lifting becomes necessary for a health check, slide one hand under her chest and the other firmly under her hindquarters, holding her close to your body so her powerful back legs cannot thrust into empty air. Short, successful sessions teach her that hands predict treats and return trips to the floor, not chases around the pen.
Expand Space and Watch Appetite Across the First Week
A Californian who eats hay promptly, flops on her side and investigates a new box is ready for a larger exercise area attached to the pen. Add one room at a time with cords covered, baseboards watched and other pets kept behind a closed door until meetings can be slow and supervised. Call a rabbit-savvy veterinarian promptly if she has not eaten for many hours, produces very small or no droppings, grinds her teeth while hunched, or breathes fast at rest, because gut slowdown in a large rabbit escalates quickly. Keep a shared note of hay intake, droppings and brave moments so patterns are visible to every helper, and let KinsLe Family Sharing keep that Californian's settling notes where the whole household can follow one routine.