When people have asked, I've generally said no very large breeds and no violent breeds. 

Type, breed, size and age matter.

I don't view this as breeding hostility, they know upon signing that I expect rent on time and if they cant do that then expect a notice in the mail and pay by the 7th day or prepare to move.

Does anyone have experience allowing pit bulls or other "dangerous breeds" in low income housing units?

If the dog appears to be a breed that your insurance company will not cover, you can require the applicant to have the dog DNA tested, in order to verify that it will not be a financial hardship for you to allow them to move in with a dog that could cause you to lose your insurance.You don't have to allow a reasonable accommodation request that will cause you financial hardship.  

A breed ban should be nullified in that case, if in fact they truly are a service dog.

@Regina Sitterley ask your insurance provider about dogs because mine has a list of prohibited breeds.

Because most larger breeds are bred for a purpose...a "job" so to speak, which often means they housebreak and are better trained / behaved than most small dogs who are often treated as "babies" with no rules whatsoever. 

SUCCESS BREEDS SUCCESS

I'm a new Investor seekIng InformatIon and hopIng ones would care as If It was them.At tImes we have enough to get started but not aware of exact's.Some cases breed not havIng money,credIt, the rIght people to mentor and care so they fade.I'm seekIng communIty famIly support.It takes a vIllage.Lol!