Source: Paramount Pictures The good news is Clifford’s heartworm test came back negative. The bad news is a bit more complicated, as he tested positive for demon blood. Ever since you started bringing your dog here, me and the other vets couldn’t wrap our brains around why he was so big, and so red. Your explanation that the runt of his litter grew to over twenty-five feet because your daughter, Emily, showered him with so much affection raised more than a few eyebrows. But after a full examination, I regret to inform you that his unusual size and color cannot…