Mario is a 9 lb service dog, so four on the floor everywhere we go is almost mandatory. I am vigilant to avoid other dogs, but nobody is perfect when it comes to anything, attention included. I watch my kiddo and Mario diligently, but I will not state nothing could ever happen on my watch. I am terrified another dog will attack and traumatize Mario thus setting us back years:
An Off Leash Dog Ruined My Life: A Service Dog’s Story | notes from a dog walker
It does not matter where you are, if another dog attacks your leashed dog unprovoked then it is the other dog's owners responsibility. If the attacked dog's owner was paying attention or not, when a dog attacks unprovoked it is that dog's owners responsibility.
I know I would be furious if another dog attacked our leashed, trained, completely passive service dog likely setting both him and my daughter back years. I would attempt to keep my cool to mitigate the damage already done, but I would still be furious!!