Hi I have a rescue gsd he was a stray and not sure how long he was a stray for but we picked him up a couple days after he came to the shelter and he's amazing the only thing is he is super reactive when he sees other dogs and today we went to meet a friend who has a staffy and obviously my dog was super reactive but he jumped up and bit the other dog above the eye the other dog was fine he didn't latch on or break skin it was like a nip but he was super r calculated when he did it almost like stalked him before the he jumped up and nipped him I was wondering if anyone has advice on getting my dog to be more social and non reactive thank you.