<human>: Give me the gist of the text in a nutshell

My boyfriend and I moved into one half of a duplex two months ago with our two dogs (4 yr old boxer/hound and 10 yr old beagle/dachshund). This week we found out that a few acquaintances of mine will be renting the other side of the duplex and that they told the landlord they will have 2 dogs. I have since received word that there will actually be 4 or 5 dogs, though I don't know that this landlord will mind that part, as my boyfriend's previous roommate in another one of this landlord's properties got two dogs without telling her.

What worries me a lot more is that one of these dogs, a mastiff puppy, has already killed another dog. They're trying to keep this information quiet, so I'm not sure how many of our mutual friends know this—I assume they didn't tell the landlord. Both sides of the duplex share a single fenced yard, and I'm concerned for our dogs' safety as well as our own. My boyfriend has a good relationship with this landlord, and I would like to discuss my concerns with her. What is the best way to bring this up? I'd prefer to have this issue resolved before they move in and not after there's already been an issue. Also, if the landlord will not void their lease, what can I do to keep our dogs safe?
<bot>: A dog that has already killed another dog is moving in next door, and we will share a yard. Looking for the best way to bring this up with my landlord before they move in?