Why did you not claim off of the person who owned the dog the attacked yours?
When Dylan was attacked by a manky-looking greyhound I took him to the vets, paid the bill myself and then went round to the owners house and left with a cheque for the full amount.
Gone but not forgotten:
325i M Sport (E92), Black Sapphire, Coral Red Dakota, 19" 225's, Seat Heating, 6FL and de-badge
Replaced by 6.2 litres of AMG powered C class.