How Much Water Should a 100 lb Dog Drink a Day?

100 fl oz/day

100 lb dog · ≈ 12.5 cups · 2.96 litres per day

Daily water for a 100 lb dog

Situation	fl oz	Cups	Litres
Typical day	100	12.5	2.96
Low (wet food diet)	50	6.2	1.48
Hot day / active	150	18.8	4.44
Upper normal limit	200	25.0	5.91

Rule of thumb only; wet food supplies part of the water. Puppies need water available at all times.

How much water should a 100 lb dog drink?

About 100 fl oz (12.5 cups, 3.0 L) a day – the common rule of 1 oz per lb of body weight. Hot weather, exercise, nursing and dry food raise it.

When is drinking too much a concern?

Consistently more than about 200 oz (2 oz/lb) a day can signal diabetes, kidney disease or Cushing’s – see your vet.