Nobody notices their pet losing 5% of their body weight by looking at them. It happens too slowly, and you see that animal every single day. It's exactly the kind of change a scale catches immediately and eyes never do.
Why it's so easy to miss
A pet who loses a little weight each month can look completely normal for a long time, especially in breeds that carry weight differently or in longer-haired cats and dogs where the change is genuinely hard to see under the coat.
What it can actually mean
Unexplained weight loss is one of the more reliable early indicators of a real range of conditions, from dental pain making eating uncomfortable, to thyroid or kidney changes, to something requiring more urgent investigation. The cause varies hugely, which is exactly why it's worth flagging rather than assuming.
Monthly, not occasional
A weigh-in only works as an early warning system if it happens on a schedule, not "whenever you remember." Monthly is frequent enough to catch a real trend and infrequent enough to actually stick with.
What to actually record
- The exact weight, at roughly the same time of day if possible
- Any change in appetite alongside it, more or less than usual
- Whether the change matches a known reason, a diet change, more exercise, or nothing obvious at all
Why we chart it instead of just logging it
A list of numbers on a page doesn't show a trend, a graph does. Halo's vitals tab plots weight automatically against a target range, the same way it charts resting breathing rate, so a slow drift is visible at a glance instead of buried in a memory of "has she always looked like this?"