Q434: I have knocked over an animal, do I have to report it to the police?
A dog (as well as a goat, horse, cattle, ass, mule, sheep and pig) does come within the remit of the Road Traffic Act and is a reportable accident, so you are required by law to report it to the police.
Important: Badgers are specially protected and it is an offence to possess one, dead or alive, (without the proper authority), so if you kill one, leave it at the roadside. If you are concerned, as stated above, you can voluntarily contact the police.