your not an idiot at all, you gave another being a good home, and applaud that greatly. nothing wrong with being new to anything, im new, i dont even have a dobie. the only way you would be a terrible person is if you bought him from a puppy mill
cropping provokes an alert conscience, but yes it's mainly aesthetic, there is nothing wrong with an uncropped dog... Its even illegal to do it in the UK if i'm not mistaken