I believe most insurers allow German Shepherds, but other breeds such as Rottweilers are almost always banned, and they could drop your policy if you take a tenant with one of those breeds.Assuming the insurance isn't an issue, it's really a personal decision and should depend on their overall qualifications vs other applicants are available.

Be sure to explore restricted dog breeds too, as you don't want common aggressive dogs in the place.

It would be much easier for you to work with buyers and sellers especially first time home buyers where you can get away with newbie mistakes in the beginning.When your in commercial your dealing with a different breed of clientele.

Mostly, members of BP are a different breed, but there are all those others out there. . .

@Scott Weston I hate volume of competition, it breeds a "race to the bottom".

Private lenders that are treated well, breed private lenders. 

If I agree, why am I breeding more of these?

Unfortunately it's often not the landlord or apartment complex that believes a certain breed of dog is dangerous but rather the insurance company that will refuse to provide coverage for certain (or in some cases all) breeds of dogs. 

@Amanda ThompsonThis will breed bad faith.

Might be good to meet the dogs.People lie about breeds.