I think you're a kind person to help this injured pigeon and I know its stressful seeing another living being injured. What you did is a wonderful thing and hope you know we need more compassionate people like you in this world.
I was confused at 1st about the "bitten black dog" - I thought you suffered a dog bite. I can understand how this one stressful event could have this affect - its like the 'last straw that broke the camels back'. Even if the pigeon doesn't make it, at least this bird felt your comfort. You did a good deed and I hope knowing this, will make you feel better. There have been adults collapsed from heart attacks on New York City sidewalks and pedestrians step over them in annoyance......you ((WobblyWombat)) are better than those people.