im sure there is a law here as i seem to remember looking into it if you kill a cat and its got a collar its up to you wether to inform the owner or not, but if you kill a dog you must inforf the owner or the local police so they can contact the owner.
when i had my calibra i killed a farmers dog as it ranout from a side entry to a feild down a country road, i hit the dog at 60mph i had no time to react, i ended up some distance down the road half embeded in a hedge, i had completle totaled my front bumper, passanger headlight, bent bonnet, passanger side front wheel arch, all of the lower skirts, ripped off my oil sump, took out my left hand wheel like you see them in rally crashes hanging off, and sheered the majority of the bolts holding the exhaust together under the car. the dog was a complete mess (died on impact unfortunatly) which in turn put me into a state of shock for a week as i came close to flipping as i tried to swerve.
i felt so bad for the farmer but he in return for me, he was very appologetic and offered to pay for the damage but it was clear from the damage that the car was a right off so that was that, i put in a claim which ended up being paid and i got enough money to buy another calibra.
but im sure there is a law that stated its not your fault if you hit a dog if it is not kept on a lead and is therefore the owners responsibility.
i know you might feel harsh going back and asking the guy for some form of compensation for the damage but at the end of the day it should not have been out on its own, and is therefore his/her's responsibility. go down to your local police and ask if there is anything that can be done, at the end of the day the owner should be gratefull that you didnt kill his dog and should give you something towards the damage, as it isnt fair towards yourself to have to pay for damage that wouldnt have happened if his dog was'nt out unattended.
gav