Dog friendly beaches near Cromer

We are off to Incleborough in a week`s time with our dog in tow.  Last time we went to Cromer we didn`t have a dog so wonder if anyone can tell us which are the best beaches for a dog near the site please.  Also have our  8 year old Grandson in tow and know that we will have to take it in turns to dog sit/go crabbing on the pier with him!