Hi, I bought a 3 month old Australian Shepard on August 1 so that my dog would have a friend. The mistake that I made though was not take them in a neutral territory. But my Corgi(my first dog; been with me for five years) gets angry and even sometimes tries to attack the puppy. What should I do so that they are able to get along? It seems as though what the pet shop tells me to do isn't working.