Blood in the stools-
Fresh, red blood may be due to rips in the anal tissue if a puppy or dog has been having many bouts of expulsion, however it can also be a sign of worms, hemorrhagic gastroenteritis and particularly for puppies under the age of 1 year it may be a sign of Parvo (parvovirus).
All of these possible causes are very serious and require medical treatment (more on this ahead)
Your Pom's temperature-
The normal body temperature of a dog is between 101 and 102.5 F (38°C to 39.2°C). To know if your Pomeranian has a fever, you will need to take his temperature rectally using a canine rectal thermometer.
Swipe it with rubbing alcohol (both before and after use), dab it with petroleum jelly, with your Pom lying down gently move his tail to the side and gently insert it approximately 1 inch (2.5 cm).
If you suspect that your Pomeranian has Parvo, the thermometer should be cleaned with bleach, as rubbing alcohol does NOT kill the virus. (Or better yet, discard and replace it with a new one).
Signs of dangerous dehydration or electrolyte imbalance-
Severe weakness, signs of dizziness, pale lips and/or gums, blue lips and/or gums, refusal or inability to drink water and/or vomiting are all signs that a Pomeranian is becoming or has already developed dehydration and/or an electrolyte imbalance which can be very dangerous for this toy breed.
Diarrhea and vomiting together is a dangerous combination for any dog, but especially for a small toy breed such as the Pomeranian. In and of itself, this often causes rapid fluid loss and imbalances that can be fatal if not professionally treated.
In addition, a combination of vomiting and diarrhea may be caused by ingestion of a poison, a severe allergic reaction or severe stage of worm infestation.
Also, hemorrhagic gastroenteritis (HGE) a very serious and sometimes fatal disease has 2 main symptoms: Diarrhea and vomiting. This must be treated with IV fluids and antibiotics - 90% of dogs properly treated by a veterinarian will survive this.