Doh... sorry to hear that. It sucks when you don't have all your digits working for you. It seems as though when you are getting near healing you will start to ignore it... then we will do something dumb and bang it on something and set yourself back a few days...
A little hardware cloth over the impeller will be a usable new guard.. just screw it through the housing with washers...
As for the finger no more Swingy... now just stumpy.
Sheperd's are great dogs. What kind of dog (aside from not friendly to other dogs) was your dads?
Have a Happy Thanksgiving, it will give you an extra day to heal and not be in the shop injuring stumpy. Let someone else carve the Turkey.