I think it was just the fact that this behavior was not a one-time occurrance, that it's not something he does to everyone, just to dad. It's hurtful that every time dad walks into the garage, Zaphod is aggressive to him. The dog doesn't know that, obviously, but because of that behavior my big boy's cool points with dad are now in the negatives.
Zaphod seriously scared him this time. Dad doesn't trust him not to bite and that leeriness is only making it worse and enabling the dog.
He doesn't want to try the food thing. He doesn't even want to get near him.
I have an idea for getting Z used to dad, but it'll require me bringing him into the house, locking up the BCs and just keeping him in the same room as dad for hours. I've spent hours with Zap so he knows who I am, but he's never been around dad for hours at a time. If dad would've gone for it, I would have had him tether Zap to him. But he thinks he'll get bit. *sigh*
I'm so frustrated right now. This dog has come a long way already and I do not want this to be the end of his stay here.
Maybe I'm not cut out for a rescued dog.
There are so many people and dogs here that a newcomer needs to get along with, maybe I really should just stick to getting young, eager-to-bond puppies from responsible breeders.