Hi, I'm new to this site and this is my first post. I had a question on my pet mouse Ramses who is about a year old. Lately he doesn't seem interested in his toys or get excited over anything anymore. He doesn't even want to eat his favorite treats like he used to. He got a little chunky and started drinking a lot of water. He doesn't even want to see me...lol He used to get excited and popcorn over me talking to him or new toys and cage changes but lately, he just lies his chubby self on his house and lays there like Garfield!! Is this behavior due to age??