Log the Same Few Things, at the Same Times, Every Day
A useful log is boring by design. Choose fixed moments — morning, midday if someone is home, evening, and last thing at night — and at each one note the same short entries: how full the water bowl is compared with when you filled it, toilet trips you actually saw, any accidents, and a word or two on appetite and energy. Use rough, honest measures rather than false precision; "bowl refilled twice, drank eagerly both times" tells a vet more than invented exact figures. Write entries at the time, on a sheet kept beside the bowl or a note on your phone, because an evening reconstruction quietly edits out exactly the ordinary details that matter.
Keep Life Steady While You Measure
A pattern only means something against a stable background, so during the logging period avoid changing food, routine, or exercise unless your vet asks you to. Note anything that legitimately varies — a hot day, a long walk, visitors, a salty treat from a grandchild — in the day's entry, because those explanations are what separate a weather blip from a genuine shift. If your senior dog drinks from more than one source, a garden bowl or a second room, either consolidate to one bowl for the logging period or note the others, since uncounted water makes the whole exercise unreliable. Other household members need the same instruction: everyone logs, in the same place, or the sheet has silent gaps.
Watch for the Changes a Vet Actually Asks About
Owners worry in general terms — "he seems thirstier" — but vets think in specifics your log can supply. Is he drinking more overall, or drinking the same amount in more frequent, longer sessions? Is he asking to go out more often, producing more each time or straining to produce little, waking at night to toilet when he never used to? Are accidents happening near the door, suggesting urgency, or unnoticed during sleep? Is appetite, weight, coat, or energy shifting alongside? You are not interpreting any of this — changes in drinking and toileting in an older dog can have many causes, and sorting them is the vet's job — but arriving with two weeks of dated observations turns that job from guesswork into reading.
Know When to Stop Logging and Call Sooner
A log is for a stable worry, not a deteriorating dog. Contact your vet promptly rather than completing the fortnight if you see straining without producing urine, blood in urine, repeated vomiting alongside the thirst change, marked lethargy, or a dog who suddenly cannot settle or seems distressed. Bring whatever log you have to that earlier appointment; even four honest days beat none. Otherwise, book the routine appointment once you have around two weeks of entries, and mention when booking that you are bringing a drinking and toileting log, so enough time is allowed to review it properly instead of squeezing it into the last minute.
Present the Pattern, Then Let the Vet Lead
At the appointment, hand over the whole log rather than your summary of it, and point to what prompted it: the first date you noticed the change and the clearest example days. Vets read raw logs quickly and often spot rhythms owners miss, such as night-time drinking clustering or weekend differences tied to routine. Ask what follow-up logging, if any, would help after the visit — sometimes a shorter version targeting one question — and file the original log with your dog's records afterward, dated and labeled, since it becomes part of the baseline the next worry gets compared against.
Keeping that log in KinsLe Pet Passport places the dated pattern alongside his bloodwork and visit summaries, so the vet reviews the whole senior picture in one packet.