Mae'r Cod Cefn Gwlad, a gyhoeddwyd gan Cyfoeth Naturiol Cymru, yn rhoi canllawiau clir ar gyfrifoldeb perchnogion cŵn i gadw eu cŵn dan reolaeth effeithiol.
The Countryside Code, published by Natural Resources Wales, provides clear guidance on the responsibility of dog owners to keep their dogs under effective control.