If the person concerned has committed an offence, just like anyone else (in most cases more so, as the police are frightened they will appear to show favourable treatment to an officer) he/she will be prosecuted.
Although, as I know officers treat their dogs as part of the family and are often over protective, I suspect this will prove to be an awful accident brought about by a number of misunderstandings. There is no chance that an officer deliberately left his dogs in danger.
We will just have to wait for the facts to be disclosed.
PS I am not an animal lover.