Love the pics.
This one showed up almost 4 months ago and I'm pretty sure he has a bunch of heeler in him. Should have named him Shadow, as mama can't go anywhere without him following right next to her. Hell, she was in the bathroom yesterday, door partial open and he opened it the rest of the way and lied on the floor next to her. He'll stay right at the bathroom door when it's closed, front door when she leaves. He's something.
He has a high pitched YIP when he starts off chasing stuff, do heelers do that?