I am looking for the title and/or author of a book or short story from either the 50's or 60's that I read when I was a teenager. In the book, a boy finds a dog (that may have crash-landed on earth). The dog is alien and telepathic. Somehow they go to the moon. The alien dog lets the boy know about something on the moon that is not a bomb. The boy figures this out by the phrase from the bible: "there is no balm in gilead".