It means you go back to the apartment manager's office and talk to the people there and see about getting things resolved. Bringing copies of both leases with you along with any documentation you have on the agreement to "break" the lease early.

Or, you can pay your lawyer his hourly rate to handle it for you.

PS: You should have been calling the police about the dog's running loose, especially the bites. And after the first experience why the heck didn't you start to carry some sort of personal protection that would keep the dogs at bay: Taser, Pepper Spray, Handgun, just to name a few possibilities.