Hi, I adopted a two month ( now seven) old mixed amstaff puppy from my brother in law. Work related stuff came up unexpectedly and I will be leaving the country soon for about 4 months. I was thinking about having my sister take care of him seeing as she already has three outside dogs and a very large enclosed yard. How well will he adjust being outside all the time and will all the effort for housetraining be gone. Will he even want to live in a house with me after all that time apart?