 The Pacific dogfish prefers to live mainly in saltwater, but they can live in and tolerate brackish water (a mix of salt and fresh water).Migratory patterns of Pacific spiny dogfish are not well understood.Analyses of tagged dogfish have shown a seasonal north-south migration along the west coast of the United States and Canada as well as a seasonal pattern of dogfish tagged in the inside waters of the Puget Sound repeatedly leaving that area for outside coastal waters in the summer.