I have a 2 year old labrador bitch that is a great 'at heel' deer dog. Bomb proof heel when stalking, bomb proof stay, no whining and indicates deer very well indeed leading to a number of kills in places/situations I would not have bothered stalking to were it not for this indication.
For a variety of reasons (laziness and overconfidence as well as a short period not stalking due to work/family) I've done very little trailing with her. A couple of trails which she was fine at and then into work in the field. I now realise that she isn't very good tending to head off on unwounded deer trails etc.
Any tips for trail training an older dog? I presume there is no reason why she shouldn't become proficient with some practice?