Maddox the cat told Chance and Kiya not to mess with him. This is how it usually ends, sometimes manual intervention is needed. But they all love each other.
No idea, sometimes with mixes it's so hard to tell what the parentage is. I do think that your dog's head is a bit more refined than many of the pit mixes i've seen.
I upload them to my Picasa albums and then just copy the link, like so:
https://picasaweb.google.com/lh/photo/_PGzvfiV0R72VJUxRpfIuIvghBGkeU4iPSQ4F4Ai0qs?feat=directlink