So glad to hear your hen is no worse the wear. I raise, train and show large guardian breed Dogs (NOT livestock guardians) and so I see both sides of the problem on occasion. My personal dogs are raised following us as we do chores so we rarely have an issue there and strays are usually sent packing by whoever is running around (our home raised are boundry trained). We have secure kennels for "Newbies" and "Trainees". Hot wire is usually pretty effective against dogs as well, though sometimes the hens wander under the fence. We also use bird shot for rattlesnakes or unwelcome 4 legged critters. BB guns are often useful to warn off the curious neighbor dog that needs to learn about boundries.
That being said, I have resorted to SSS in the past and will have no problem doing so again should it be necessary. I have told ALL of my neighbors that if any of my dogs is OFF my property to please send them home, if the dog is acting threating in ANY way while OFF my property they have my permission to shoot the dog and I will pay for the bullet. Am I serious? you bet, we live in the country where there are no leash laws but you DO have the right to protect yourself and your stock. Dogs are not the "Gods" out here. I find that mind set madding. A predator is a predator, is fertilizer. Training is everything, leashes are used for belts.
Sorry about the soapbox, I just can't imagin not being able to protect my chickens.