Dormice are small rodents , with a body length of between 6 a , and weighing between 15 a. They are usually mouse-like in appearance , but they have furry tails instead of scaly tails . Dormice are small for rodents , with a body length of between 6 a , and weighing between 15 a. They are generally mouse-like in appearance , but with furred , rather than scaly , tails .