First I taught Blind Stays, using a long line. This was a 15-foot length of cotton clothesline to which I had attached a harness snap to one end. I would put him on a sit-stay near a doorway, then walk through the door where he couldn't see me, keeping hold of the end of the long line. If he moved away from me I would feel it, but if he came looking for me of course I would see him. In either case he would get a correction for breaking from the Sit-stay. I gradually lengthened the time I asked him to hold, up to five minutes. Then I got a helper, someone from my classes, to help, by asking them to call him, not using his name at first. Just, Nice puppy, here boy, pat legs, clap hands, kissy noises, that sort of thing. Again, if he broke, I would correct. Gradually we increased the temptations, up to and including treats. This all took time, taking place over weeks, even months. My dog was a celebrity in the community. I did not want him stolen or poisoned. He was with me a lot. I could leave him on a down-stay outside a gas station while i went inside to pay and know he would still be there when I came out, even if I had to wait in line. I did come out once to find a man trying to lure him away. Too bad for you, dog thief!This is fantastic. (Especially for a Golden, who will generally adore anyone with food or a ball—I grew up with them and know! Ha!) Do you mind explaining how you did this? Very impressive. (Plus great way to teach little ones about strangers.)
Sorry you miss him so much...I know exactly how you feel. But we don't miss them if we didn't love them, too.