I would think that the watch me command would be ideal in getting a dog to focus...yes you do use treats and you work your way from inside the house, to outside, then on walks, then on walks with people/dogs present..etc. I think they need to learn to focus and just focus before that can be used with other commands. Put the dog in a sit say watch me, if dog doesn't look, DO NOT repeat command, make a noise, get the dogs attention, then give a treat once it looks at you..repeat as needed and the dog will get it. Once the dog gets it, use it in different settings. Hold the treat up to your eyes and say watch me, at first the dog is watching the treat, but eventually it learns to watch you.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD