Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 2 zaps and problem digging was cured

Length:: 0:25 MinsThis is my 80 lb dog who was constantly digging under the fence. This charger worked perfectly. She won't go near that wire and does not dig anywhere now. Very effective and cheap. Only took 2 zaps to cure her of constant digging. Highly recommended!