Day one caution, then a rapid thaw
A young rat arriving home typically hides in the darkest cage corner for the first hours, venturing out to eat and drink when the room quiets, but the thaw after that is usually the fastest of any small pet. By the second or third day, expect him at the bars when you enter, whiskers forward, following your movement and investigating any finger offered through the bars with whiskers and gentle teeth-testing rather than biting. By the end of the week, most youngsters are climbing to the cage door in anticipation of coming out, having learned your routine almost as well as you have.
Companions and a cage worth living in
Young rats should live with other rats, ideally littermates or carefully introduced same-sex companions, and the first week is when sleeping piles, mutual grooming, and play-wrestling establish their order. Furnish a tall, secure cage with hammocks, ropes, shelves, a solid wheel if they use one, boxes to shred, and several water bottles so nobody guards the only drink. Bars must be close enough that a slim youngster cannot squeeze through, and the door latch should defeat a clever, persistent paw, because rats test closures methodically every single night.
Handling and first out-of-cage time
Start with treats taken from an open palm inside the cage, then brief lifts onto your lap or into a bonding pouch, keeping sessions short and frequent rather than rare and long. Young rats who are scooped confidently and supported fully, rather than dangled or chased, usually become the ones who ride on shoulders as adults. First free-range time belongs in a small, blocked-off space like a dry bathtub or playpen, with cables, gaps, and other pets excluded, and with you sitting in it as the furniture they climb. Expect exploration first and cuddling later, in that order.
Eating, sounds, and body language this week
Offer a quality rat diet with small amounts of vegetables and occasional protein extras, using tiny training treats for hand-feeding so enthusiasm does not replace nutrition. Learn the week's sounds and signals: bruxing, a soft tooth-grinding, means contentment, sometimes paired with eye boggling at peak relaxation; squeaks during wrestling are usually negotiation, while a puffed, sidling rat is genuinely annoyed and should be given space. Sneezing in a new home is common for a day or two as noses adjust, but it should fade rather than build.
First-week health watch-outs for rats
Contact a veterinarian familiar with rats if sneezing persists with red discharge around the eyes or nose, breathing becomes wheezy or laboured, or a youngster stops eating, hunches alone away from the group, or develops a swelling. Check daily that water bottles flow and that a smaller youngster is actually getting food rather than being shouldered aside at every feed. Quarantine and vet-check any rat who arrives already sneezing heavily before close contact with resident rats, since respiratory illness spreads through a group quickly. When a 2 a.m. behaviour or a new-rat question leaves you unsure whether what you are seeing is normal, KinsLe's Kimmy can be asked for guidance in the moment, and what you learn stays alongside your rat's profile for the next time it comes up.