separation anxiety ?

hi, i wanted to ask you guys about what do you do with super anxious dogs i'm sitting a big sized 5 years ols german shepherd
he is very attached to his owner after he left he stayed by the door waiting for him and whining i tired to play in the backyard and give him his treats but somehow he gets distracted for a while and run back to the door, its been now over 4 hours he's still looking everywhere, he pulls and runs so hard that i might stumble and fall so taking him for a walk is not an option but do i have any other tricks to sooth him ? thanks

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I have "No Pull" harnesses of all sizes for all my pups I watch. I explain at the meet & greet that it gives me control of the pups during walks. I pet sit in my home for all overnight, short and long stays. It gives me control over pullers and dogs that can slip out of the step-in harnesses.