How Much Water Should a 40 lb Dog Drink a Day?

40 fl oz/day

40 lb dog · ≈ 5.0 cups · 1.18 litres per day

Daily water for a 40 lb dog

Situation	fl oz	Cups	Litres
Typical day	40	5.0	1.18
Low (wet food diet)	20	2.5	0.59
Hot day / active	60	7.5	1.77
Upper normal limit	80	10.0	2.37

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

How much water should a 40 lb dog drink?

About 40 fl oz (5.0 cups, 1.2 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 80 oz (2 oz/lb) a day can signal diabetes, kidney disease or Cushing’s – see your vet.