@Jeanni Prescan
You can check with your local code enforcement, to see if they are breaking any codes. Some cities/counties require dogs to be kept in certain types of fencing or kennels, especially certain breeds.
You could add an addendum to your existing lease, or change your current lease to include the amount of a pet deposit, if you will allow animals at all, or what types of animals you will allow depending on the laws in your area (discuss this with your attorney).
Provide the code enforcement and animal control phone numbers for your neighbors that live near the home.
Many insurance companies will not insure rental properties with aggressive breed dogs, so it might be in your best interest to do everything you can legally, until they move or get rid of the dogs.
If the dogs are living inside the house, you might want to get your funds ready and have your contractors already lined up, especially if there is carpet in the home. I know exactly how you feel, and I've been there. Let me know how this goes for you.