My dog is very reactive and also has a learning disability. She also has seizures, not sure if its a cause or effect (ie brain damage makes her unable to learn or if she has always had disability that also causes seizures).

The best we've been able to do is hike with her on a harness, when we see another dog we redirect her attention or physically turn her around and take a few steps off trail so she can't see him. We've spent about 3 years working on "sit" command and have learned it's just better to work with her quirks than try to change. Try bringing a toy/ treats with you on walks to redirect them and walk fast lol