This is an interesting suggestion given that in my experience, dogs do not exhibit curving towards humans. Dogs that make eye contact with me, usually make a beeline towards me regardless of their leash condition. It seems like dogs have learned that humans do not curve and approach directly. This is probably similar tho how dogs can read human facial expressions even better than they can read dog expressions.
I would not be surprised if most dogs are socialized to humans (vs they need to be socialized with other dogs)