This will depend on the jurisdiction.
In the united-kingdom, I think more information is needed. In Fardon v Harcourt-Rivington, Lord Atkin made it clear that
[Failing to control dogs] is a liability which exists only in the case either of wild animals, which have by their nature a mischievous propensity, or of tame animals which are known to the persons having control to have a particular mischievous propensity.
In that case, the dog owner didn't know that his dog would behave harmfully to the public and kept his dog inside a locked car. Later, that dog went mad and smashed the window, which caused injury to the pedestrians walking by. The court ruled that the owner need not be liable for his dog's act as he did not know his dog would commit such an act.
For the united-states:
In McQuaker v Goddard, Scott LJ explained that, as a common law rule, wild animals are presumed to be dangerous to people, while domestic animals are not. Therefore, unless the owner of a domestic animal knows that the animal has a propensity to hurt human beings (or property), there is no liability upon the owner.
So, to claim from the owner, you need to show the court that he is aware of the potential danger and that he negligently forgot to protect public safety.