I just had this happen Wednesday. Could be a coincidence, I don't believe it is. I took my dog to the vet last week. She had a strange growth on her shoulder. It was flat and hard, just under the skin. Vet thought it was very strange. She poked it with a needle to get a tissue sample. She called me Monday to let me know it was most likely a Sarcoma based on the type of cells she found. Even with the best treatment, dogs usually die within a year. I prayed that night. I told God I know it's only a dog but could you please heal her. She is so gentle and loyal, I don't want her to suffer. The Bible tells us to ask, so I did.
I took her back to the vet Wednesday to get xrays, to see if it traveled to her lungs which is common since she pants a lot and has a cough. Her lungs looked good, the problem was they couldn't find the mass. The same vet tech was there and she couldn't find it either. We all looked and it's just gone. Was it God, chance, coincidence? I'm going with God.