Dreaming of a rat is a sign of a serious problem. It may also show a theft or loss of money. Seeing rats in a dream means false situations, deceit, jealousy and envy. You have enemies who will do damage. Seeing a white rat in a dream means distress and that you will get help at an unexpected moment.
Dream dictionary: white rat in dream dream meanings
…Rats, whether white, black, or brown, singly or collectively, import illness, death, and serious misfortunes.The night before his son was drowned at sea, a man I once met dreamed his bedroom was full of enormous black rats with grey eyes that raced round and round the bed, and eventually leaped into the empty grate and disappeared up the chimney.Another person, a lady in London, if I remember rightly, dreamed that she saw her youngest daughter sitting on the floor playing with a big brown rat that suddenly sprang at her, tore the ribbon out of her hand, and raced out of the room with it. Some days later, this particular daughter developed consumption, of which she eventually died….