Monthly Is the Right Interval for a Snake Who Hides
An elderly Kenyan sand boa can spend weeks invisible beneath the substrate, eating what is offered at the surface and shedding out of sight, which makes a fixed monthly weighing the backbone of her home monitoring. Monthly is frequent enough that a slow weight loss becomes a visible trend within a season, and spaced enough that digging her up does not become a weekly disturbance she learns to dread. Choose the same point in her cycle each time — a few days after a meal has passed through, and not while she is deep in a shed, when her weight and her temper both read differently. Weigh her in a smooth tub with a lid she cannot push off, zeroed on the scale first.
Reading Condition on a Thick, Heavy Body
A Kenyan sand boa is built like a rolling pin, so judge an elderly one's condition by feel and profile together: her cross-section should stay rounded, with the spine present under your fingers but never standing up as a sharp ridge along her back. As you support her during the weighing, let her move slowly through your hands and feel for sections that bend stiffly, kink, or resist curving the way the rest of her does. A boa who is losing condition often shows it first as a slight triangular sharpening when she lies on a flat surface, and as ribs that become countable by touch along her flanks. Photograph her from above beside a familiar object each time, because month-to-month comparison defeats the eye's habit of adjusting to gradual change.
Eyes, Skin and the Story in the Shed
Use the monthly handling to check an elderly Kenyan sand boa's eyes for clarity outside a shed cycle, since a sand boa's eyes sit exposed to substrate whenever she surfaces and can pick up scratches or retained caps. Her skin should feel smooth and unbroken, with no crusty patches along the belly she drags through the substrate and no mites at the folds around the jaw. Keep her last complete shed if you can recover it from the substrate: a shed that comes away in one piece, eye caps included, is a quiet certificate of good condition, while sheds that start tearing over the same stiff section of spine tell you where her body is struggling. Note which it was beside the weight.
When the Monthly Numbers Say See a Vet
Take an elderly Kenyan sand boa to a reptile veterinarian when the log shows weight falling across two or three consecutive months, when she refuses meals she would normally take from the surface, or when you find a swelling, a persistent kink, or retained shed that a warm soak does not release. Also act on breathing changes — a boa heard wheezing at the enclosure glass or sitting with her head raised and mouth slightly open is not a weighing problem but an urgent one. Bring the records with you; a vet can do far more with a dated series than with a guess that she seems smaller lately. Keeping that series in her KinsLe Pet Passport means her weights, sheds and feeding notes travel as one tidy history wherever she is treated.