Park in the Wildlife Trust, Fishlake Meadows car park in Oxlease Meadows (https://w3w.co/yacht.strumming.prowl ) or in "Southern Aquatics" on the road north of Romsey. This walk is about 1.8 miles and usually has few other dogs.
Much of this route is a nature reserve, but paths are fenced to prevent dogs straying into sensitive areas. If walking without a dog, stray into the centre of the reserve to see rare water birds from the hides.