I love animals and I feel bad for ya, and the dog.
I remember one time when i was in school i had to was trying to get my housing all taken care of and had to be on the other side of campus. I came running out of the building and ran over a squirrell, on foot!!!
There were people just a standing around enjoying their day and they all gasped in awe. I had to keep going because I only had a few minutes to get there. I made it, but I always wondered about the poor little guy.
I dont know if it make you feel any better, but at least u didnt trample the poor little guy and have to look down it him.
All the more reason for people to spay, nueter, or fence pets, and look out for squirrels....