Before they went to school the kids took some old socks that they had been wearing and stuffed a small teddy into each one. We put these in Buddy's bed so that he would feel snug, like he did sleeping surrounded by his mum and littermates. He would also get used to the smells of our family.
This seemed to work, and he didn't wake us up at all the first night. He didn't really wake us during the night with crying at all. The first few nights he was a bit fretful when we put him to bed, and he took a while to settle. But once he got to sleep he stayed in his bed until about 6am.