A leopard gecko's day-one record should freeze the details his later care is judged by: where he came from, his morph if the seller named one, his first weight once settled, and a photograph with the tail fully visible. The tail stores fat for this species, so its thickness in that first picture is the reference every later worry gets checked against. Note whether he arrived with all toes intact and any old shed marks; small details like a missing toe tip are part of his history, and writing them down now stops them being mistaken for new injuries later.
Feeding and dusting, logged insect by insect
Write down what your leopard gecko eats at each feed: which insects, how many he actually took, and whether the calcium or vitamin dusting happened that day. Leopard geckos can turn fussy about a feeder they once loved, and a log showing the week the preference changed is more useful than a general feeling that he eats less now. Note where he hunts from and how eagerly, since a gecko who stops emerging from the hide at feeding time is behaving differently in a way worth dating. Pair the feeding entries with regular weights so appetite and body condition can be read side by side.
Temperatures, hides, and the corner that tells the truth
Record the floor temperature at your leopard gecko's warm hide, the cool-side reading, and which hide he favours, because digestion in this species depends on belly heat he can reach. Leopard geckos usually pass droppings in one chosen corner, which makes a simple note easy: frequency, appearance, and any change. A sudden change in that corner's output, read against the temperature entry beside it, often explains itself. Log substrate and enclosure changes too, particularly any move away from loose substrate or a change of heat source, with the date the change was made.
Sheds and the toe check that follows each one
Write down every shed your leopard gecko completes and inspect the toes immediately after, recording whether the skin cleared or clung. Retained shed on leopard gecko toes is a recurring problem that tightens gradually, and two consecutive log entries mentioning residue are the signal to adjust humidity in the moist hide and watch closely. Note the tail's condition at the same time, plus any eggs from a female, including infertile clutches, with how her appetite and weight responded around laying. These small entries, kept faithfully, are the difference between spotting a trend and discovering a problem.
When the gecko's record points to the vet
Contact a reptile vet if your leopard gecko's tail thins steadily while feeding notes stay normal, if toes keep shed skin or look constricted, if droppings change and stay changed, or if he stops eating beyond a short seasonal dip. Bring the weight run, shed notes, and warm-hide temperatures; gecko cases turn on exactly those details. Keeping the arrival photo, feeding log, shed checks, and vet entries together in a KinsLe Pet Passport means a leopard gecko's slow changes are written where they cannot quietly slip past you.