Your puppy is distressing you, how do you think that he feels. Please ignore the people who say that your puppy should be left to cry. He is missing his mother and his litter mates. Beware if he is left to cry he WILL develop "separation anxiety" which will plague him and you for the rest of his life. I have had sixteen dogs and when they were puppies they did not cry and none of them ever developed "seperation anxiety".This is a rehearsal for your puppy settling down at night. You will be able to do it for a couple of hours after school and both you and your puppy will have a peaceful night. If you don't do this you will have weeks of sleepless nights.
The following will ensure that he does not suffer from separation anxiety and does not miss his mum and his litter mates. This is also vital if you want your dog to be clean and potty trained.
Put your dog in a separate room where he can rest undisturbed. then go out of this room and close the door. Open the door immediately and go into the room again, ignore your dog whilst pretending to clean the counter tops or pretend to do something else for a very short time. Go out of the room and immediately go back in again, keep doing this and gradually increase the amount of time which you stay on the other side of the door.
Timing is vital and you must get back into the room BEFORE YOUR PUPPY CRIES. Eventually your puppy will go to sleep and will be convinced that you are just on the other side of the door. When you know that he is asleep stop going into the room, however you MUST LISTEN FOR HIM WAKING UP.
When you know that he is awake, go into the room lift him up and CARRY HIM into the garden for a pee and whilst he is doing this say “get one” and praise him profusely. Puppies need feeding about four times a day, although he may have a pee before his feed you should also take him out again afterwards. You must always take him out when it wakes up and after he has had food or drink. It’s also a good idea to let him explore your yard/garden afterwards and play with him. Before you go to bed, take him out again and when you wake up take him out immediately
It is vital that you continue with the door thing for the first few days. To ensure that you have a happy puppy, try to devote as much time to him as possible for the first two weeks. This will help with potty training, however he will not have any control for the first few months and he will pee during the night... To help him, use newspaper that you have rubbed in one of the pees that he has done outside and leave several layers of newspaper on the floor. Hopefully he will toilet on the newspaper during the night. Or you could set the alarm and let him into the garden during the night.
You should also encourage visitors as this will help with his socialisation. Later when you able to take him out, walk around supermarkets where there are lots of people. Stand at the school gates and watch the children coming out and you MUST take him to puppy classes to get used to other dogs.
GOOD LUCK.