Question: To coax the dog into the yard once he's run away.
Options:
If the dog wont come back to the yard, you can go sit on the edge of the yard and bark and pant and hop around like a dog, until, out of confusion,  he comes to see what you're saying.
Run outside with his favorite treat and call for him announcing the treat you 're offering.
Answer: Run outside with his favorite treat and call for him announcing the treat you 're offering.