I can relate.

4 weeks ago, I was making breakfast and cut my ring finger with
a knife. The cut was deep in the shape of a smile and I got down to the
Tendon and cut some nerves. The worse part for me was the numbing shot
too. (I am such a woosh) I could not watch the Doc put the stitches in.

I was careless, and in your case their was nothing you could
do to prevent the dog bite.
Sorry you had to miss your mushroom hunting trip.
Sending many many good healing wishes for your finger to heal
perfectly.