It is quite possible the original owner trained him to potty only on walks, and not in the yard (some folks prefer that). Anyway, I recommend putting the leash on him, and accompany him into the yard to potty. For one thing, it might simulate a walk for him, helping him to relax, and for another, it will keep him from crawling under and hiding in inaccessible places. When he does finally go in the yard, praise him and let him know he did the right thing. It may take a week or two for him to become comfortable pottying in the yard. When we got our dog as a puppy, our yard wasn't fenced, so we had to leash her to take her out. When we did get a fence, she had a hard time going off-leash, and even then, it took two weeks for her to go by herself, without supervision!
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