Mostly flat walk alongside the Fleet lagoon from Weymouth to Abbotsbury. Several access points from roads along the way. Ferry bridge to Abbotsburry, 10.5 miles. Not good after wet spell. Very tranquil especially off season. plenty of water for dogs to splash in and cool off with some small streams for drinking. Can get quite remote.
Full Walk Details
Pick up coast path at Ferrybridge and follow signs for Abbotsbury. Good idea to have OS map of area then you can plan a circle route using the various access points.