I think you should ask the man if he'd pay all of the vet bill, as it was his negligence with his dog that caused the problem in the first place. If he refuses then I'd contact animal control.

What I'm kinda wondering about is your vets choice to prescribe Tylenol for your dog in conjunction with Asprin. Asprin I understand, but the Tylenol has me baffled.

Either way I hope your doggie is feeling better soon and has no permenant damage from this horrible incident, your children as well.