You are a wise and conscientious steward for your dog.
But when I run down my list for dog attacks I know #1 is true, she slips the leash and #2 is true, #3 is true with the neighbors dog (when I came to get her with the muzzle), I can DAMN sure make sure that #4 isn't true.
#1 Large and/or aggressive breed of dog?
#2 Running loose/ often >1 running loose?
#3 Prior reports of aggression?
#4 Unrealistic assessment of the aggressiveness of the dog (often despite #3 above)?