Scott Rhee's Reviews > Monster Blood

Due to the fact that his dad has been transferred and the family has to move, Evan has to stay the summer with his Aunt Kathryn. Besides being really old and weird, she's also completely deaf. Evan befriends a girl named Andy in the neighborhood. They buy an old jar of slimy green goo called "Monster Blood", which appears to have no purpose other than to be slimy. Evan's dog manages to eat some, and a few days later, the dog has doubled in size. The goo also appears to be growing, quickly outgrowing its small jar. It also appears to be breathing, as if it's alive...

R.L. Stine's "Monster Blood", part of his best-selling Goosebumps series, is another fun, gross, creepy horror story for kids.