The owners need to be in jail 1 year for every tooth mark that man received and if they can’t figure out how many that is, just put them in for life. And sell everything they own to pay the guy’s bills.
Imagine, if you will, the sympathy USPS lawyers have for dog owners who used to laugh while inflicting 60,000 dog bites per year on the letter carriers. Now that number is quite small ~ proving ruinous law suits do encourage better behavior on the part of owners.