When I was working with mine with his dog reactivity the trainers always told me to always watch the dog and always keep them focused on you. If they aren't focused on you they are looking for trouble. The prong collar would help, at the very least slow the dog down.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD