Unleashed Dog Attacked My Dog And I Pepper Sprayed It.

Washington county, OR if it matters. Was walking my dog and a neighbors dog all of a sudden ran up on us and bit my dogs neck and took him to the ground. yelled at them to get it off and they werent doing anything. I pepper sprayed the dog and it got off. They still didnt contain the dog. It was coming back to attack again and I pepper sprayed it again and the owner finally took it inside. My dog is 15 and already has health problems with his back and legs. Right after this happened the man was yelling at me and I yelled back and told him I'm calling the cops and he said for what nothing happened. He went to go see his dog and the wife came to talk to me and was very reasonable. She apologized and gave me her number. I'm still not sure if I'm going to call animal control or just talk to them. I dont want the dog to be put down but I also want to feel safe. The wife explained to me that her husband doesnt listen to her and he thinks the dog isnt going to do anything-basically an irresponsible owner. Even though the dog is a rescue and abused, he thinks the training is working and he can just have the dog unleashed. Hopefully this opens his eyes up but I'm pissed that it had to be my dog.

Did i act illegally? Any advice on what I should do from here? Im a dog lover and feel for her, I dont want her to be put down, but given what the wife said, i also am not confident that the male owner is going to learn from this and muzzle and leash his dog if i just talk to them. I would prefer to talk to them but i want to feel safe in my neighborhood and again I dont know if this guy is gonna learn from this. This same dog has nipped at my toddler because he said she was friendly.

Edit: added state

Update: Yall are right. On every point. I cant imagine this being a kid next time.. I’m calling first thing tomorrow. From research it seems euthanasia is usually a last resort. Hopefully animal control will enforce a muzzle and fines or something like that.