In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Cann like this:
CANN, or Shaston-St. Rumbold, a parish in Shaftesbury district, Dorset; on the verge of the county, 1¼ mile SE of Shaftesbury, and 4¼ SSE of Semley r. station. Post Town, Shaftesbury, under Salisbury. Acres, 930. Pop., 547. Houses, 126. The area is all included in the borough of Shaftesbury. The living is a rectory in the diocese of Salisbury. Value, £196.* Patron, the Earl of Shaftesbury.
GB Historical GIS / University of Portsmouth, History of Cann in North Dorset | Map and description, A Vision of Britain through Time.
Date accessed: 27th April 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time , and maybe some references to other places called " Cann ".