I personally would not leave a young puppy in the yard like that. My last puppy was a digger, and would put anything in his mouth and swallow it - dirt, sticks, rocks, etc... It could be extremely dangerous and even fatal for a young pup to occupy himself like that while unattended. Dogs explore with their mouths, and there's a lot of stuff to get into outside, and too much can happen in a 12-hour window. Who will be feeding the puppy while you're gone?
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