Sorry I haven't replied sooner - I have been in hospital. Unfortunately, all my hard work has gone down the drain! My husband and son have had to walk the dogs for the past couple of weeks and it seems Dexter just barks most of the walk. It just seems to be excitement - he doesn't bark at other dogs, just barks happily as he runs around!!!!
Once I am recovered (another couple of weeks I am afraid) I will start again from scratch - I know he can do it, so just need to go back to square one and do it all over again!
At least the dogs have had their walks so although they missed me (and I missed them!) they weren't totally hyper when I finally got home late on Christmas eve!