Dog cancer, black stool, not eating: Are masses ruptured? Any hope?

If the masses on the liver / spleen ruptured, I would expect her abdomen to be getting larger and her gums to be getting pale due to the hemorrhage. If she has black tarry stool, my concern is that the cancer is also somewhere in the GI tract. If clinically she is unchanged and doing ok, I would speak with the oncologist and see what the recommendations are in regards to this. The fact that there are cancerous changes evident on the liver and spleen, tells me that this is spreading, which is not good. However, that being said, these could be benign. I just worked on my friends dog who had a liver mass and splenic tumor in his dog. I surgically removed a liver lobe and the spleen and the dog is doing better than ever still and this was done about 6 months ago. There is no way to tell for sure whether or not these are cancerous masses until a biopsy is done or the masses are removed and sent out to the laboratory for testing. As long as Chewy is stable and doing the same, I would recommend speaking with the oncologist and see what their opinion is considering all of these changes. I hope this helps guide you in the right direction. Please let me know if you have any other questions or concerns and I would be more than happy to help you further.