Do you take him to places where you can let him off and play with him? He may be more enthusiastic if he knows he's going somewhere fun. Does he like toys at all? If so, you could take his favourite toy to encourage him, and also do some training while you are out. Playing and fun training could help to focus his mind on something - you and the game - rather than 'the scary stuff'. Also a number of short, fun walks and play might help rather than a couple of longer ones until he's happier. I vary my dogs' walks and routes - sometimes we go in the car, sometimes from the house, but they associate 'walking' with fun, especially Ollie who loves games. Emily never refuses to walk, but dislikes one of the parks (for some odd reason), so when I do take them there (rarely) I make sure I take her some treats so we can do some training and she loves that. Most of their walks are off lead as they enjoy that more than road walking. Hope Charlie starts to enjoy his walks soon.