There is no steady rule for dog socialization. It entirely depends on your dog. You should never force your dog to spend time with other dogs. It is absolutely okay if your dog does not want to be around other dogs. Do not over socialize your dog. You should be most important for your dog, not any other species. At the same time, it is not right for your dog to have aggression towards other dogs. Dog lunging or biting is not right and needs to be addressed.