I'll go with Richard on this one - I used to be an injury claims handler and would occasionally have to deal with dog bite cases. The burden of proof is not as great here but getting your money if the owner doesn't have any kind of insurance that might cover the loss might be a problem. However, it might make them think a bit about their responsibility for the dog if it looks as if they are going to be hit in the pocket.

Sounds as if the police round your way think they have more important things to do. Wonder what will happen if this dog bites and badly injures a child next time.