If it is still on the small side and not fully developed, a veterinarian may decide that a local anesthetic would be appropriate for puppy under the age of 1. However, once it is fully developed, this would be a surgery, comparable to an amputation.
The entire piece, the toe and claw, are removed. Quite a few stitches will need to be put into place and healing time can vary from 2 to 4 weeks.
During that time, care must be taken to keep the area clean. Many Poms will be prone to licking at the site, which can interfere with recovery time.
This is done by an experienced veterinarian and done so under general anesthesia.
For this reason, many owners choose to have this done at the same time that spaying or neutering is performed...so that the Pomeranian only needs to have the anesthesia one time.