Delgado was the same with strange dogs then he found out strange dogs were fun to play with too and that lead to him being leash reactive.
I would encourage your dog to ignore other dogs and focus only on you, the less other dogs (outside of dogs that belong to family and friends) 'exist' in his world the easier it will be for you.
Sounds about right !! Btw love the name Delgado haha
Ace Von Backyard 3/12/2014