I have have a Cavalier King Charles Spaniel named Jack. He is 16 months old. He also also been through 8 weeks of Puppy Eucation and 8 weeks of Intermediate Education. I have some issues with him that I could use some help trying to solve. When out on walks, Jack breathes heavy, pants, sorta growls and eventually barks at other dogs we see while walking. The barking usually comes after we have walked completely passed the other dog and its owner. We typically do not stop to greet other dogs. We are on a mission for our walk and for him to do his "business." I own a row style townhouse and we do not have our own yard. Dogs must be leashed when outside the owner's unit. I have tried no-bark command with treats, which is not really helping. He also barks as others walk by on the walking path that goes infront of our house. The no bark command with treat works for him in this situation sometimes works. Any ideas? Do we do more dog training classes? This is a nice dog breed, but I am sure my neighbors think Jack is a nut of a dog.