I have two 12 year old miniature female dachshunds (Dagny and Daphnee, litter mates). During the last two months they have been drinking lots of water and peeing allover the house for no apparent reason. They have had accidents inside before but have never done anything like this. The vet has ruled out diabetes and kidney problems. They eat Iams puppy chow, are given table scraps and are let out frequently but continue to pee inside the house.