Puppies - You may be surprised to know that for Pomeranian puppies (and for puppies of just about every toy breed), trauma is the leading cause of death (more ahead)
For adult Pomeranians, the top 3 leading causes of death are:
Gastrointestinal, 15%. This includes such disease as pancreatitis, inflammatory bowel disease (IBD), intestinal obstruction, exocrine pancreatic insufficiency (EPI), lymphangiectasia and other forms of protein-losing enteropathy.
Sadly, this is the 2nd leading cause of death for adult Poms and the #1 leading cause of death for puppies. This includes being dropped, being accidentally stepped on, trauma received in a car accident as a passenger and being hit by an automobile.
This includes viral disease such as parvovirus and distemper,protozoal disease, such as babesiosis and leishmaniasis, bacterial infections including leptospirosis and also most tick diseases and fungal infections including blastomycosis and histoplasmosis.
* Interestingly, the Pomeranian breed has one of the lowest rates of death due to cancer (7.9%), even though this is a leading cause for many toy breeds.