‘Leinenpflicht’ is a requirement that you walk your dog on a lead.
There is no general obligation to walk your dog on a lead everywhere in Saxony, but the cities of Dresden and Leipzig have enacted these rules. Dogs may only run free here in dog-walking fields.
In all other parks and open spaces that are not explicitly designated as dog play areas or dog-walking fields, your dog must be walked on a lead.
Furthermore, there is a general requirement to walk your dog on a lead in designated hunting areas in Saxony, with violations punishable with a fine of up to €5,000.