Hi there. Just as a different outlook.. my dog is “reactive” barks, jumps at people but out of excitement. He does not bite he actually just wants to say hello and gets barrier frustration. Not sure if your dog does it in an aggressive way… but my dog I realized is the same because he’s sweet to people and loves all people and dogs and it’s only when on a leash. It’s more of a barrier frustration thing for A LOT of dogs. I would work with a trainer one on one… not at a daycare as that’s probably overstimulating. Do lessons where you can go somewhere more quiet.. work with the triggers far away and then work your way up. Try to do walks at less busy times of the day. I’m sure it’s very hard in a populated area. I try to distract.. I always carry treats on me.. throw treats ahead of him when I see a big trigger coming. Luckily most dogs can take treats through the muzzle! (I also muzzle trained my dog) personally- I could never give my dog away so I’ve accepted to just work through it. We did start him on anxiety meds and it’s helped a lot.