Why? Did you think there could be a reason that dog attacks people...could have been it’s genetics. I once had a cocker spaniel...who came from a litter of pups who all had to be pit down...it was in that litter’s genes.
Yeah, genetics; that’s the ticket. On two dogs in a row. What are the odds?
That is a dog that requires a leader. He’s a beta dog forced to try to be alpha. I’ve rescued lots of dogs like that. The minute they realize there is a leader they are actually relieved. They can be rehabilitated but only if they are in a home with strong leadership