Were you looking for ideas or personal experiences of places? If just ideas using the search terms "holiday cottage the broads slipway dog friendly" brings up loads of website returns.
You clearly asked for Recommendations so here is mine. The Sutton Staithe Hotel is a very good place. You can also overnight there in a camper van or Motorhome. They allow dogs in the rooms also
Little video of when we stayed in our motorhome in the Hotels Car Park
My favourite scenery on the broads in Wrotham to Cotishal. I launched at Wroxham, you get slipway key from a newsagent. I stayed at a pub in Wroxham, don't know if it's dog friendly. If you go the other way the next day I saw some kingfishers
