A slim snake hides change well
Yes, keep one. A garter snake is built narrow and stays active even when it is not thriving, darting, swimming and investigating right up until a problem is advanced. There is no heavy body to read by eye, and a keeper can handle the snake daily without noticing that the spine has become a little more prominent or the body a little flatter in cross-section. Weight is the honest measure here. A small kitchen scale and a dated entry every few weeks catch a slide that this species' energy works hard to disguise.
Why the varied garter diet belongs in writing
Garter snakes eat a broader menu than most pet snakes: fish, earthworms, amphibian-scented items and rodent pieces all appear in captive feeding, often rotated. That variety is a strength, but it makes recall hopeless. Which prey was refused, which was taken eagerly, and whether a regurgitation followed a particular item are exactly the details a log preserves. Feeding frequency matters too, because garters have a brisker metabolism than heavy constrictors and eat smaller meals more often. Writing down the rhythm lets you see whether a snake that seems hungry constantly is actually growing, holding, or quietly losing ground despite eating.
What to record beyond the scale
Add shed dates and quality, since frequent, complete sheds track well with growth in a young garter. Note water behaviour: long soaks can be normal enjoyment for this semi-aquatic snake, but a new habit of constant soaking paired with weight loss is worth flagging. Record droppings, which come more frequently than a rodent-eating snake's, and any musk-heavy, unusually defensive handling sessions in a snake that is normally tolerant. For group-housed garters, and this species is sometimes kept in small groups, the log should name which individual ate, because the bold snake at the front is not proof the shy one fed at all.
Weighing a quick, wriggly snake
Use a lidded tub on the scale, zeroed with the lid on, and let the garter settle for a few seconds before reading the number through the clear side. Weigh before a feed rather than after, and keep sessions brief: garters are escape artists, and a calm, contained routine protects both the reading and the snake. Photographing the snake from above beside a ruler every couple of months gives you a length and body-shape comparison that pairs well with the weight figure, especially for juveniles whose growth is the main story.
When to take the log to a vet
Seek a reptile vet if weight drops across consecutive entries, if regurgitation repeats, or if the snake develops swellings, mouth redness or wheezy breathing. A garter that stops eating entirely for an extended stretch outside any cool seasonal slowdown, or one passing consistently watery droppings, should also be seen. Hand over the log: the prey rotation, the last accepted meal and the weight trend answer half the vet's questions before the examination starts.
That tidy history is simplest to maintain when it sits with the snake's other paperwork, and KinsLe's Pet Passport gathers your garter's records into one portable packet for vet visits, moves and sitter handovers.