The udder is an old symbol of nourishment, motherhood and plenty. Dream books read it as giving, being provided for, or the strain of always being the one who feeds others.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.