My 9 month old yorkie is turning into a nightmare to walk as she barks agressively at any other dog.?

1st you don’t let your dog off the lead until this is sorted out as you could fine your self in a lot of trouble with the police if somebody dog gets hurt and a large vet bill or your dog could get hurt and still cost you a lot of money. When you take your dog out take some treats with you and when she see people /dogs distract her with the food, Hitting or using aggression can make matters worse. Going to dog cles will help her build her up her confidence