Work with the moments she actually wants to drink
Dogs drink in bouts, not sips: after waking, after exercise, after eating, and when they greet people. A home-alone day fails her when those moments arrive and the water is stale, warm, or in another room. So design the day around her natural drinking points. Before you leave, fill her bowl with fresh water — many dogs drink noticeably more when water has just been run and the bowl has been rinsed — and offer a drink during the morning fuss and goodbye, because the excitement of you leaving often triggers one.
The midday walk is your biggest lever. A dog returns from exercise genuinely thirsty, so the walker's visit should end with fresh water offered in the room she will settle in, not a quick refill as the door closes. Ask the walker to wait a moment, let her drink her fill undisturbed, then top the bowl back up before leaving, so the afternoon starts from a full bowl rather than a half-finished one.
Bowl placement, freshness, and a second station
Put a second, heavy bowl where she actually spends the alone hours — by her bed or in the room she chooses — instead of expecting her to trek to the kitchen. Heavy ceramic or weighted bowls resist tipping; a spilled bowl at ten in the morning means a dry dog by three, so stability matters more than capacity on alone days.
Refresh everything when you get home, whatever is left: water that has sat all day with dust and hair in it is water many dogs will only drink from when desperate.
Measure quietly so a dip shows up early
You cannot fix intake you cannot see. Note roughly what you put in and what remains — a measuring jug fill in the morning makes this effortless: if she usually takes most of a litre across a workday and starts leaving three-quarters untouched, something has changed days before it would otherwise be obvious. Ask the walker to glance and report too: bowl nearly empty at midday means your morning fill or placement is failing her in the first stretch, which is exactly when a second station helps.
Pair water with the day's food thoughtfully. Dry food increases total water need, so on alone days a portion of her meal given before you leave, with fresh water beside it, spreads drinking across the morning rather than loading it all into the evening.
Reading low intake — and when it matters
A dog who drinks less on a cool, quiet alone day than on a busy family day is often fine; activity drives thirst. What matters is a change from her own normal, or low drinking combined with other signs: dry sticky gums, obvious tiredness, loss of appetite, vomiting or loose stools, or straining to pass urine. Those combinations mean a vet the same day, because dehydration in a dog left alone can quietly compound. Equally, a sudden large increase in drinking — bowls emptied early, asking for more, night-time toilet trips — is vet information too, and your rough measurements become genuinely useful evidence of when it started.
The everyday system, though, is simple and it works: fresh water at her natural drinking moments, bowls where she rests, and someone midday who treats the refill as part of the job rather than an afterthought. Recording that midday duty in KinsLe, where Care Teams let the walker confirm the water was refreshed and note how much she drank, gives you a clear picture of her intake even on the days you never see her bowl.