What causes a senior dog's swollen belly, testicular lumps, and poor appetite?
Poor Storm! It's hard to say for sure what might be causing this without seeing him. From what you describe, I would be concerned that he may have a testicular infection or even testicular cancer. If his belly looks swollen, this is often a sign of fluid in the abdomen, which can be caused by cancer, liver failure, heart disease, or internal bleeding. It does sounds like this is a serious problem, so I would recommend having him seen by a vet right away - he/she can do blood work and x-rays to help determine the problem and see what can be done to help him.
Updated on September 23rd, 2025