Koa is 10.5 weeks old and I'm not a trainer but he loves to play chase and run after me. While running, I clap my hands and keep repeating "come on Koa, come on". I'll get a little ahead of him (now that he's faster than I am I have to trick him by going around an object and he'll try to cut me off) but I'll turn around and as he's coming right at me I kneel down, clap my hands and say repeat "come on Koa, come on" and he bounds right into my arms and I praise him excitedly. In the short 2.5 weeks we've had him, I'm the only one that can reliably get him to come to me because I'll just kneel down, clap my hands and use the same excited words as when we're playing and he'll come right to me. My husband and kids are just starting to use the technique and it's instantly working like a charm with them as well. I'm not sure if it would work on older dogs but good luck!