The shelter I adopted Tank from in Horn Lake, MS does nothing with their dogs they adopt out. They are not wormed, vaccinated, spayed/neutered or anything. The real crappy thing is that TONS of Pit bulls are taken in by that shelter and adopt out unaltered and they will basically just adopt out to anyone that walks though the doors. They are a rural shelter though and are low on funds which is the reason why.
It really sucks and I still do not understand why some shelters adopt out dogs who are unaltered.