Guessing tells you almost nothing about a senior dog. A bowl that looks half empty may hold her usual portion or a worrying drop, and a water bowl topped up by three different people hides every trend. Meaningful monitoring replaces impressions with numbers gathered the same way, at the same times, until her own normal pattern is written down.
Set Up Measuring You Can Repeat Daily
Use one scoop or, better, a small kitchen scale, and serve her food by weight so every meal starts from an identical amount. Weigh the bowl again when she walks away and note the remainder rather than rounding it to nearly all or barely any. For water, fill a marked jug each morning, pour from that jug only, and record the level left in the jug plus the amount remaining in her bowl at the evening refill. Keep bowl, jug and scale in one place so the routine takes a minute and survives busy days. If she drinks from more than one bowl, count them all or reduce her to one main bowl during the baseline period, with a second person in the house told not to refill without noting it.
Keep One Short Log With Four Fixed Fields
A useful log stays small enough to complete daily. Give every entry the same four measurements, written in the same order each day. A worked entry might read: food offered in grams, two hundred and forty; food left in grams, sixty; water offered in millilitres, nine hundred; water left in millilitres, two hundred and fifty. Add the day beside the figures, and add a brief note only when something unusual happened, such as a hot afternoon, visitors, or a missed walk. Run the log for a settled week before calling anything her baseline, because appetite and thirst shift with weather, activity and household excitement. Once that baseline exists, compare each new week against it rather than against yesterday, since single days wobble for harmless reasons.
Read Trends as Possibilities, Not Conclusions
What matters is direction over time: food left rising week by week, water offered needing constant increases, or both shifting together. Those patterns are information for a vet to investigate, not a diagnosis you can make at the kitchen counter. A gradual change can accompany many possibilities a vet may explore, including dental discomfort, altered mobility that makes reaching the bowl harder, or an underlying condition that blood and urine testing can clarify. Note related observations beside the figures, such as she rises and resettles herself more slowly, she hesitates at the bowl, or she asks to go out overnight more often. Never change her diet quantity sharply because of one odd day; instead, book a vet conversation when a trend holds across a week or arrives suddenly, and take the log with you so the discussion starts from evidence.
Take the Record Wherever She Is Cared For
The log only helps if it travels with her to appointments, stays with a sitter, and survives a house move. Keep the paper sheet, her vaccination pages and recent visit summaries together rather than scattered across drawers and phone photos. Anyone covering a weekend should record the same four fields in the same way, or the baseline breaks exactly when you need it. Filed together like this, her figures belong in the portable packet KinsLe calls Pet Passport, a single record you can hand across at reception so the vet reads her intake trend before examining her.