Molly, 3, will lead the parade from Les Beaucamps High School to the White Rock, to commemorate some 240 volunteers from the Royal Guernsey Militia who marched the route on 4 March 1915, where they were greeted by an estimated 15,000 people.
From there they embarked for Weymouth, en route to Fermoy, Co. Cork, Ireland, where they formed D company, 6th Battalion Royal Irish Regiment, which shipped to France on 19 December.
Parade commander Bob Place was keen to find the same breed of dog as the one that had led the original parade.
'I saw some people on the beach with a very young one which they said would be too boisterous but they said they might know somebody else who could help,' he said.
Mr Place was directed to Chris Carter, who works in marketing with Specsavers and his lawyer wife, Liz, who works for Brown's.
The parade will form at 9am. It will go via Rue du Preel, Castel Church, Rohais de Haut, Ladies' College and The Grange and is scheduled to arrive at The White at 10.25am, where it will be addressed by the Lt-Governor.
At 10.40am, it will march to the Town Church for a commemorative service at 11am.
