Lumps Found During or After a Heat Cycle
If you notice lumps on your Pomeranian that appear around the nipples during or after a heat cycle (in the mammary area around the teats), this often is a strong indication of mammary gland hyperplasia.
Mammary gland hyperplasia is an excessive growth of mammary epithelial cells. The difference between mammary gland hyperplasia and canine breast cancer is that with mammary gland hyperplasia, the cells are benign, with cancer the cells are malignant.
The only method to determine if these lumps are cancerous or non-cancerous is to surgically remove every lump for examination. For example, if a Pomeranian has 5 lumps, after removal and examination, a veterinarian may find that 4 are benign and one is malignant.
With the Pomeranian breed, 50% of tumors are found to be malignant, therefore paying attention to lumps that appear around the nipples (teats) at any time - and most noticeable during or right after the heat cycle, is vital to your Pom's health.