I was just thinking that as well, the others that are on the chain don't drink much either. I switched the bowls in the morning and later so i don't really measure but i do notice they don't drink water at all neither. I'm wondering if the water missing is from evaporation lol. In fact the only dog that does drink water is one of my buddy's that I'm holding and believe it or not, she is the one and only kibble fed dog here. He don't want her on raw so i told him long as he buys the food she can stay. Her Water bowl is always closer to empty than half way lol.