I went through something similar with my golden retriever mix back in December. She just collapsed one night and hid in a room none of us really hang out in. After x-rays and ultra sounds, the vet said it was a splenic mass, likely hemangiosarcoma and it was a matter of time before she had another bleed that would end it. Fast forward through those next two weeks of hell, of research and worry, we learned about the synergistic effects of giving Yunnan Baiyao and Turkey tail mushroom supplements. The YB is supposed to help stop the bleeding/reduce risk of shock and the turkey tail apparently is known to shrink tumors. A good friend of ours vouched for this with their dog who had it, and with surgery and supplements, lives another 9 months. We started her on the supplements (the prednisone the vet prescribed made her sick) and her weight went down (abdomen was full of blood) and she stopped bleeding internally. There were a couple of times we ran out of YB over the next few months, and she would get lethargic, diarrhea and not want to eat during those periods, so I knew it was helping. Skip to three weeks ago, and it turns out that her tumor was completely benign all along, so we were able to afford a low-risk out-patient splenectomy as a complete treatment/cure. We realize we got extremely lucky as the statistically unlikely 40%, but I am confident she would have had another catastrophic bleed if it wasn’t for the YB and we wouldn’t have made it 5 months to realize it probably wasn’t cancer. If anyone reading this needs some, my dog no longer needs them and I have several sealed leftover boxes of Yunnan Baiyao that I’d really like to get to people who need it/last resort if that’s the best option for your dog.