A yorkie who is bored can become yappy. I have one who is "quiet" and one who is quite a talker. And despite the fact that they are small, they do need lots of exercise- they are terriers first, small in stature second.
The smaller the puppy, the more likely it is to develop hypoglycemia. 8 hours alone might be too long. You might want to consider adopting a slightly older (a year) pup to help minimize the chances with that.
Also, it's not clear from your post, are you planning on leaving the dog outside during the time you are gone? Yorkies are far too fragile to be outdoor dogs.
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