Sounds great.You and your dog on the trail.Cows can be very dangerous,they seem to chase,surround and crush people,and worse with dogs.Even a gang of goats during my walk on the Pembroke coast made me realize im alone a lot of the time.They were probably harmless though.I can see the walk really is a realistic idea and with campsites on the way should be easy to plan,and i tend to follow my instincts rather than a single route.The hill sections might be the tricky bits.dorset and jersey offer a challenge.I think i might need a contour map.