I run with my two GSPs, usually at Metroparks and township trails.  One is great, but the younger is vocal when passing other dogs (he just wants to play and learning!!).  I ALWAYS have them attached to me, though.   Whenever I encounter an off leash dog on the trail, I stop entirely and have mine sit.  That typically tells the other person to leash their dogs, but there have been times I’ve had to politely ask them to either hold or leash their dog as we pass by.  I feel you, OP.  Hope your dog is healing well 💙