I am so *terribly* sorry this happened to Avril (and to you) :grouphug I am sending a ton of good thoughts for speedy healing and hope the seizures were just a result of the shock. Glad to read your girl is a little better
I have been there. I know what it's like to see your beloved dog attacked and be scared of walking him/her in the neighborhood again.I just told myself to breathe, be rational and focus on all the times I walked him and he was fine. After Merlin was attacked in 2008, I started carrying a stick AND citronella spray. I had to use the citronella once or twice, from a distance. The spray goes very far, which is great, and acts as a good deterrent to keep approaching dogs at a distance - unless a dog is hell-bent on attacking, as in your situation and ours - in which case, the stick will have to be used. I don't want to to hurt any sentient being unless absolutely necessary, and this is one of those cases I deem to be absolutely necessary. However, I had to drop the stick after we adopted Sagan - I only have two hands and it's too much to have two leashes, poop bags, and in the winter loves to take on and off AND a flashlight... it would be impossible for me to hold a stick as well. The one thing I have changed is that I never walk in the street where the dog who attacked Merlin lives. He is still there, still out of control (he came from a puppy mill and is messed up in the head), and his humans are clueless. They tried to use a shock collar to stop him from freaking out when he sees other dogs - go figure... So I stay away.
I know EXACTLY what you mean about things happening so fast that you have no idea what's going on before it's too late. Sometimes it happens that way. But on many occasions you do have a little time and using a spray CAN help. As for the stick - it can be a bit of a nuisance, but I can guarantee that it will make you feel safer to know that you're prepared. I will admit that my eyes are EVERYWHERE when I walk the dogs, I am always on the alert for off-leash dogs, but really, it's like that wherever you live - because there are ignorant, irresponsible people everywhere. However, I won't let ANYTHING stop me from walking the dogs, because that's what they want and need.