Every week or two, not once in a while
An elderly bearded dragon should be weighed every one to two weeks, with a proper check-over built into the same session. That pace is tighter than for most pet reptiles because a bearded dragon runs a hot, busy metabolism: it basks, patrols, and eats daily, so a slide in appetite or strength shows up in the weight within weeks. Monthly weighing can let a real decline hide between readings. Weigh at the same time of day, ideally before the first feed, on a flat gram scale the dragon can sit on without being gripped or rushed.
Reading a bearded dragon's body, not just its weight
Reading an elderly bearded dragon's body means checking the places fat and muscle show first. The fat pads on top of the head should feel gently rounded, not sunken; the tail base should stay thick rather than narrowing to a point just behind the hips; and the hip bones should not stand out sharply. A dragon can hold a similar weight while losing muscle and gaining a soft belly, so the hands-on check matters as much as the number. Note beard color and alertness too, since an elderly dragon that stays dark and flat through the warm part of the day is giving you information alongside the scale.
The check-over, step by step for this lizard
A check-over for an elderly bearded dragon starts with watching it walk a short distance on a flat surface, because stiff, wobbly, or reluctant movement is easier to see than to feel. Look over the toes and tail tip for stuck shed, check the mouth line for swelling or crusting when the dragon gapes or eats, and glance at the vent area for cleanliness. Feel the limbs gently for swelling and watch whether the dragon holds itself up strongly or sags onto its belly. Offer a familiar food item and note the aim and enthusiasm of the strike, since an older dragon that starts missing easy targets deserves a mention at the next vet visit.
Keeping the routine low-stress for a senior dragon
Keeping the routine low-stress for a senior bearded dragon means making weigh-ins predictable rather than elaborate. Use the same scale, the same spot, and the same calm handling, and return the dragon to its basking area promptly so it can warm back up. Avoid weighing right after a large meal or a bath, both of which distort the reading, and avoid chasing a reluctant dragon around the enclosure to meet a schedule. If the dragon is shedding heavily or having an off day, a two-day delay harms nothing; what matters is that the series of readings stays roughly weekly to fortnightly across the season.
When the home record points to the vet
The home record points to the vet when an elderly bearded dragon drops weight across two or three consecutive readings, when the head fat pads visibly sink, or when it stops basking and stays hidden through the day. Repeatedly missing food, dragging a limb, trembling, or a persistently black beard paired with lethargy also warrant a prompt call rather than another week of watching. Take the dated weights and your notes on appetite and movement with you. Storing that series in KinsLe Pet Passport gives your bearded dragon's vet a ready-made history to work from.