I have a 12 year old male beagle who has been prone to cysts all over his body. the vet said that they are ok, but the last year, they bleed. Now, the last couple of days, he has a lump on the side of his neck near his lymph node that is the size of a small grapefruit. It does not hurt him to the touch, and his mobility is fine. Could the lumps have turned cancerous and spread?