My dog just sneezed blood, several times. I'm v worried. Background is he's had a lump on his head for a couple of weeks. Took him to the vet and they took some samples - they were all bloody not clear and the vet appeared v worried. We are still awaiting the results. I'm now terrified that this is linked and a v bad sign. Any ideas of what it could be? He's 12 and otherwise v fit and healthy