my 17 year old son was knocked off his 50cc motorbike last year by a large dog which ran straight out from behind a car giving him no chance to even brake,although he was only doing 20 mph, having just pulled away from a railway crossing,he broke his little finger and damaged the bike,i called the police who duly attended the owner and filed a report ,after the owner assured him that the dog had never escaped from the garden before,although it was well known in the village for being out on its own.
my son needed surgery to his finger and i contacted one of the injury lawyers who frequent every channel you watch or listen to,only to be told that a claim could be made against the dogs owner if he had third party cover on his house insurance.
i tried that approach just to meet a pig ignorant chappie and wife who just told me they had no insurance,and that was the end of it.
unfortunately a passing large gull dropped a brick through their car window not long after. i did laugh.