Usually 1 ounce per pound of body weight daily will meet their needs. So if your dog is 8 pounds and there are 8 ounces in a cup then they should drink about 1 cup a day. This is if they are eating hard food. If they are eating moist food they should drink lots less. I would leave water out 24/7 until your dog sees a vet. It is probably just a fascination with drinking but could be something as serious as diabetes insipidus and limiting water could do serious damage. I would talk to your vet...
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