Oh I really do feel for you... it's awful when your dog gets attacked, and esp under such circumstances as no owner in sight
but please don't let this incident spoil your pleasure or confidence in going for walks....
The boys and I were set upon by some stray dogs a few months ago as we were just leaving my street (when I moved it was hard to adjust anyways - my old house had fields literally on my doorstep, now I live in a built up cul-de-sac and can only access fields by walking through the close and crossing a busy main road)... there are a lot of stray dogs and also irresponsible owners close by to me and the whole scenario has meant that at the moment I don't take them for walks locally - they get put in the car and driven to the local parks/woodlands... I still enjoy our walks and so do the boys, but the other night I got really panicked as I thought there was a black dog ahead of us with no owner/lead on (turned out to be a tree stump

but still... I didn't realise how much it would shake me up just expecting another attack...).... I miss being confident enough to walk the dogs again out the front door and amongst the neighbourhood but am not quite there yet, I kinda panic cos both my hands are tied up with a lead in each hand so no free one to batter off an attacking dog - not that i guess that's the best thing to do

...
I hope if you are upto it and when he heals, that you both can resume normal activity and this dogs irresponsible owner doesn't knock your confidence too much, and good for you for reporting it to the dog warden... and sending huge ((get well soon)) thoughts for Jed...
tinks x