What are the least aggressive dogs?

It all depends on how you raise it. If you raise it to bite and be mean then it will be aggressive. If you treat it well and teach it to not bite it won't be aggressive. I'd say most bigger breeds tend to be more aggressive than littler breeds because they have more power. I'm not sure but I think you should get a medium breed and try to treat it very good but don't spoil it because after you spoil it, it won't want to be un-spoiled. Hope I could help.