Hi guys, should I be worried that Meeko is drinking a lot of water, or should that be expected for a sheltie in warm weather? He drinks a lot more than the others, though he is bigger, he's always over at the water bottle, and the three boys run out of water much sooner than the girls. I think he is middle aged or older, but I don't know and don't know his medical history, because he was a rescue. They get lots of fresh grass and greens and other veggies and have shade from the sun. He eats a normal amount. Other than diabetes, what else would cause excessive drinking? And does this sound like a cause for concern, when otherwise he seems healthy. He's looking healthier all the time since I got him, though he is not fat, not really skinny, but I'm hoping he might gain a little weight.