Yeah, in just a couple months the dog might not even have started showing their "normal" behaviour yet. Sometimes it takes a looong time before they get truly comfortable with the new environment, even if they seem to be doing just fine, and that naturally can affect the relationship they have with the owners. All relationships are different, and that applies to relationships with dogs too... Living together, and you both growing to learn each other's personalities and all, will likely change things over time.

If you felt, you do not like the dog at all, then giving up is a good thing, though, no matter what some people say. All dogs deserve a home where they are loved, and sometimes finding a better place for them, is the greatest act of love you can give.