answered 2/21/2010 My Dog Is Drinking A Lot Of Water, And Is Losing Weight. He Doesn't Have His Usual Energy. What Should I Do? Get your dog tested for diabetes...they have the same symptoms that people do when they are diabetic and even given insulin...My cockapoo was diabetic and I gave her 2 shots a day till she passed away at age 14yr. ...christineandsadie