What a handsome fella! I hope I don't make it worse for you when I say that I feel it's a sign. Things happen for a reason (the parvo). He'll probably just need patience. I know with Logan, I had no idea what her issues were, dispite having an open adoption and speaking to her previous owners. (The SPCA called her for permission for me to call, but she doesn't know who I am or where I live). She was housebroken but peed inside the first day (fear) and pooped once when I didn't realize she wanted out. It took some time to readjust her to our ways, but by the end of the first week, she was a different dog! Still have some things to work on, but she;s blossomed! Of course, I only have the one dog, but you sound pretty fantastic at training so far, so I pray things work out.