How do you train - and particularly recall train - a dog who has zero interest in food generally and zero interest in toys or attention when out on walks?? I've tried everything to interest him - bacon, chicken, balls, sticks, being generally interesting, long lead training, jumping around like a loon with chunks of cheese hanging off me, feeding all his food to him by hand in the garden - but he just has no interest in any of it. I let him off lead right from the time he was able to go for walks and he was going great (looked for me constantly, came on call consistently) until a few weeks ago when he just decided he wouldn't bother taking any notice of me at all and we had a couple of incidents when he would have been out of the park like a shot had the gate been open. I've had to resort to walking him on the lead all the time and it's making me sad, but I've got no confidence in being able to get him back safely if I let him off. He's 6 months old.