Most landlords restrict aggressive breeds due to insurance carrier guidelines. Restricted breeds typically include: 

• Pit Bull–Type Dogs: Includes American Pit Bull Terriers, American Staffordshire Terriers, Staffordshire Bull Terriers, and American Bulldogs.
• Rottweilers.
• German Shepherds.
• Doberman Pinschers.
• Chow Chows.
• Huskies and Alaskan Malamutes: Sometimes restricted due to high energy levels, vocal nature, and potential for destructive behavior in confined spaces.
• Akitas.
• Wolf Hybrids.
• Mastiffs and Cane Corsos: Restricted due to large size and protective nature.
• Great Danes: Often restricted due to their immense size, even though they are known as "gentle giants". 

Please keep in mind that restrictions may vary amongst different landlords.