A service "animal" i will not say dog's any more because of the fact that servrel animals can be trained for the job, When in Service they must have papper proving there services, some will have vest and some will have a harness with there i.d card on it........here's a unknow fact.......it's called Bellas bill it was pushed and passed in to law by sharon mcconnell......if your dog were to attack a service dog and it requires retraining because of the attack you are responsable for the retraining of that service dog..... i spent many of my summers in maine with sharon, and watched her lose her sight slowly over the years ( she's about 9 years older then me) . she is the most amazing person i've ever met in my life.....she might of lost her sight but her sense of humor was there.....and a great sculpter