Yes, and group housing is the strongest reason. Fire-bellied toads are small, active, semi-aquatic, and usually kept in groups where every animal looks broadly alike. Without per-toad records, owners remember the group eating well, not the one individual who has been shouldered away from food for a month. A simple log gives each toad its own story.
Why group life hides individual problems
At feeding time these toads pile toward movement, snapping at crickets and at each other's toes in the excitement. The quickest animals eat visibly and often, which creates a reassuring impression that carries over to the whole enclosure. A slower toad can lose condition gradually while the group as a whole still looks lively, and because these toads are only a few centimetres long, modest weight loss is hard to judge by eye across a glass front.
Individual weights solve that. A toad whose numbers slide while its tank mates hold steady has told you something specific, and the date on the first falling entry tells you when the problem roughly began.
A workable weighing routine for small toads
Use a small cup with a little dechlorinated water, tared on a gram scale, and weigh one toad at a time with damp hands. Identify each animal by its back pattern, which differs enough between individuals to photograph once and use as a reference. Weighing every few weeks suits healthy adults; a toad you are watching closely can be checked weekly for a short stretch without turning the routine into a daily disturbance.
Log weight, what was eaten, and behaviour at the water's edge: swimming strongly, soaking for long periods, or staying on land when it normally splits its time. Add notes on skin condition, any bloating, and the bright belly coloration if it looks dulled. Record water changes and temperature alongside, since semi-aquatic toads react quickly to stale water.
Patterns worth acting on
Act on one toad diverging from the group: falling weight while others gain, repeated failure to strike at food, or being consistently displaced at feeding. Also flag bloating, skin lesions, cloudy eyes, or a toad floating listlessly rather than swimming with purpose. Feeding that individual separately for a while, and noting the result in its log, both helps the toad and tests whether competition was the cause.
If a toad keeps declining despite separate feeding, take its individual record to an amphibian-savvy veterinarian. A history that isolates one animal from a healthy group narrows the conversation in a useful way, and your dated entries show what you already tried.
One record per toad, kept together
The discipline that makes this work is separation: never merge the group into a single entry. A line per toad, even a short one, preserves the contrast that reveals trouble, and pattern photographs pinned to each record prevent mix-ups as markings shift slightly with age and condition.
KinsLe's Pet Passport supports exactly that habit, holding each fire-bellied toad's records together in one portable packet per animal, so a single toad's history can be shared at the clinic without dragging the whole group's paperwork along.