Hi Prima!

I know it's hard to quell the instinct to chase'em, when you
think they're running off, but next time try excitedly calling his
name and then running in the opposite direction from him. By
running after him yelling "Stay", you've more or less taught him
that "Stay" means run from you.

You might also wanna start working on the "Come" Command.
Put a leash on him, Call his name and "Come", then excitedly run
a few steps from him. Stop as he comes to you, Praise and give
him a treat. He should naturally come to you as you run from
him, but if he doesn't that's what the leash is for. Reel him in to
you, praise and treat. Basically you want to only give the
command, when you can enforce it, so that he doesn't get
confused or decide "Come" doesn't always mean "Come".

Par...