Abdominal tumors, both benign and malignant, can cause a dog’s belly to swell. Tumors in the liver, spleen, or other abdominal organs can lead to either direct enlargement or cause secondary ...

A lipoma is a benign (noncancerous) tumor of fat in middle-aged or older dogs. Lipomas can grow anywhere on the dog's body, even inside their abdomen. But the most common growth is under their ...

Fatty tumors, also known as lipomas, happen most often in middle-aged or older dogs, especially around the ribs, although they can show up anywhere. They're considered a natural part of aging.