I agee- the water consumption sounds normal but do a search on Iams and you'll probably want to switch. They have animal cruelty issues. Also dogs are usually better off with a wheat and corn free diet. Good luck!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226