Is the wool felted? Felted wool is already shrunk so you can cut the edges without fraying. If it is small blocks they should hand wash fine and block to dry. If it is whole quilt I wouldn't getting it wet because wool is HEAVY when wet and would take days to dry.
Try a sample of your wool and wash it and lay it on a white paper towel to dry. This should give you some idea of shrinkage or bleeding.
If you are worried about colours bleeding in any quilt, a front loader is not the best for washing a quilt. A quilt does best in a top loader where you have lots of water to float away any fabric dye.