How Much Water Should a 20 lb Dog Drink a Day?

20 fl oz/day

20 lb dog · ≈ 2.5 cups · 0.59 litres per day

Daily water for a 20 lb dog

Situation	fl oz	Cups	Litres
Typical day	20	2.5	0.59
Low (wet food diet)	10	1.2	0.30
Hot day / active	30	3.8	0.89
Upper normal limit	40	5.0	1.18

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

How much water should a 20 lb dog drink?

About 20 fl oz (2.5 cups, 0.6 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 40 oz (2 oz/lb) a day can signal diabetes, kidney disease or Cushing’s – see your vet.