I went through this a couple of years ago, hemangiosarcoma. The dog was never sick a day in her life, all of a sudden at age 9 1/2, a cough and poor appetite. Multiple tests $ confirmed the diagnosis, no treatment options, one month left.
If it has spread to her lungs, the tumors burst and they have difficulty breathing.
Is she a pure breed? Often these things have a genetic component, inbreeding can be a factor.
I would keep her comfortable, ask the vet that examined her to confirm the diagnosis and what does he recommend? If you can afford to and it will give you peace of mind seek another opinion….I tried but found the 3-4 vets I spoke to all said the same thing. They did however prescribe comfort meds.
PS: Increased appetite is a side effect of prednisone.
If the dog is young, consider taking her to a cancer specialist.
