Static collars

[jonboy 0]

What are the views on using static collars. Cut a long stort short have a 4 year old border dog, have bought him on does really well at most. Year before last i suffered a back injury a few months before i used him for tracking deer on a long line which he excelled at. When i returned just after Christmas gone took him to the local shoot where we had been going for a few years. Kept him to heal as always, till i sent him out a little way to flush the birds, he spotted sheep and was off, he went deaf, returned 10 min later. Took him onto the tops where i know the farmer next door, on a long line through the flock for a couple of weeks, no problem, then took line off, kept to heel till my eyes strayed and he was off. Know the fellas where a go not a problem apart from the embarreshment, but he is a good little worker, but can't really do it on a long line. Need advice please.