
When reading this, it sounds like the exact same situation I had back in October with my two min pins. My calm one got attacked, not the one that was paying attention to things around her.
Dogs that seem to be under control, and calm, seem to get attacked more often than those who are a little out there. The followers of the dog world are considered weakest, so another dog, if wanting to make an attack, will go for them.
Even when my other min pin (who wasnt attacked) was growling, barking, hackles up everything, the dog didnt pay attention to her at all. Casie, who was the one that was attacked, was total show mode on the walk. Looking straight ahead, not paying attention to anything but where the collar was on her neck. Cher, was willing to rip the dog apart, yet the dog didnt go after her. Cher started being aggressive after the dog already was on Casie.
Casie turned out ok, with lots of Ice on her swelling, and cleaning of her wounds.
So sorry to hear about your Perry. Hope he is ok. And hope you are ok as well. An attack seems to go on forever. It is one of the most scariest things that can happen.