Has the victim spoke with his insurance company about these events? I would think the insurance company would hold the dog owner accountable for the expenses they incurred, as a result of the dog owners negligence. (Not safely confining or controlling his dogs)
The insurance companies have their own attorneys, who don't worry about who's feet they step on, or wallets they lighten as they're only concern is not losing money by making payouts on a claim for which there is clearly a party that can and should be held accountable for the incident which brought forth the claim
Also, you may be having trouble getting answers and/or explanations concerning the normal procedures followed in this type of situation, because according to you're post, you are not involved in this matter. Aside from being a concerned neighbor and possibly afraid the dogs could harm you or you're family, you have no claim or legal right to receive any reply or explanation in this matter. It is between you're neighbor, the dog owner and the department of animal control.
If you're neighbor gets his insurance company involved and they send out an investigator and/or have their legal department contact the involved parties, he will probably see a whole new response to the matter as it will not be something that can be so easily swept under the carpet. (If that is what is happening) The insurance company will get to the truth and all the involved parties should be aware of this. As such, it would be quite foolish for them to play any games changing records and/or deleting prior reports which were written up on these animals.
Have you're neighbor check with his insurance company to see what they advise.