I have two guinea pigs. Both of them are usually active and eat well. All of a sudden today, one of them is a little less active. He is just lying in a comfortable position in the corner. However, he is eating well. Now, they don't drink water from a bowl or bottle, I make sure that they have enough water in their veggies. It's way too hot in here and I've kept cooling pads for them. I'm really worried about this baby. Please help.