Those codes sound very similar to the ones here... thing is though that for a dog to be dangerous (here) they have to be RULED dangerous. When the neighbors dogs broke through the (wooden 6' privacy) fence and one BIT my husband in our own yard they were all picked up, the biter was supposedly quarantined, and next thing you know they were all back home.
Five or so months earlier they'd done the same break through on the other side of their yard. No biting, but back home in no time.
Latest is the stupid pit coming OVER the fence. In the corners, weasels up, we think so we've put up blocks to stop that. Neighbor happened to be home for lunch and saw the dog was in our yard through the one area that is chainlink (faces front) and came ang got him out (and left our gate open TYVM) while I was trying to navigate the Animal Control automated system.
But when the bite happened we did take pics, of the dogs out and the bite, we did forward them on to the official Bite Investigator... and all the dogs, biter and the other two who were not biters, were all home on the same day. The owner is the gal who was originally on the lease next door, supposedly trying to find another place, yada yada... these FOUR people all had to go in together in order to rent the house next door... so odds are they don't have tons of cash laying around to pay for an expensive insurance policy, on top of the fees to get the dogs out AGAIN (they increase each time), and the extra fees for release, license, etc if the dog had been declared dangerous. Can't get any straight answer from AC, but my guess is that they did not declare this animal dangerous... that they only do that in severe cases... and that biting one measly person in their own yard wasn't serious enough for the description. Just my theory, and hopefully different in your town, but here the dangerous dog codes only apply to those dogs that AC has ruled as officially dangerous.. MY opinion doesn't count. I've got nothing against the other two, they bark, but so do mine. But an attacking animal has NO place in a neighborhood like ours, with adults AND children who actually sit, play, walk in their own yards.
Talk to the neighbors and get EVERY statement you possibly can. Note every animal harassed OR injured OR killed. Note every time they've been out. Pictures help too. Show a history of violence and "at large". Give them the evidence, so much of it that they have no choice but to act.