I will be talking to my vet tomorrow, but it's bugging me now, so I thought I'd ask. We had an elderly border collie and have a cockapoo. Over the weekend, we went away for two nights. Our pet sitter was checking on our animals. Because of the age and the heat, I asked her to check on them twice a day to make sure they had water. Plus, the border collie has some mobility problems and I wanted to make sure he stayed close to his water. We left on Thursday and came home early Saturday evening around 5:00. When we came home, the dogs were out of water and the Border Collie was in distress and hyperventilating, couldn't move, and wouldn't drink or eat. He died a short time later. Our cockapoo was fine. I called our pet sitter, and first she said she had last been by Friday evening and he drank a bowl and a half of water, she filled up their water bowl, but he seemed okay. I didn't ask why she hadn't been by that morning-I should have. Later, she did say she had been by Saturday morning, but I noticed our newspaper had not been picked up. Fridays newspaper and mail were in the house, so I know she came by then. Anyways, I'm wondering if the span of time between Friday evening and Saturday evening would be enough to make the Border Collie die of dehydration. I hope not. I can't wait to ask my vet. Again, the little dog was fine. It doesn't seem like long enough for them to have been out of water, but maybe because of the heat it was. They were in the garage where it's cooler and not in the sun. Any ideas? Any vets out there?