We didn't get this because we brought him home at 16 weeks but a lot of people had a lot of success with:
Petstages Heartbeat Pillow - Toys - Dog - PetSmart
It's a soothing heartbeat pillow which reminds them of their mama and littermates. Also, my husband wore a tee shirt and then put it in his crate so that he had his scent. Good luck!!! By the way, this product can be found in almost any pet store.