I had one "squirrel dog", which was the family dog when I was in my teens. Coco was a liver-colored German Shepherd. She wasn't much for birds, but she lived for squirrel hunting! She knew which tree the squirrel was in and would not leave the tree until the squirrel had been shot and put into the game bag. She would run around the tree to keep the squirrel in sight, which made it a bit easier to shoot it, as anyone who has hunted squirrels will attest to.
One find day, she went up to sniff at a fallen squirrel and it locked it's jaws on her nose until she was able to shake it loose. From that day forward, she hated squirrels, so you had to be sure to get to the squirrel before she did, or you would end up with chewed game.
Coco came to live with me and my family when my parents moved to the city and could no longer keep her, so for a few more years, she was my hunting companion. At some point, she started to lose her vision and something started growing on her belly. She was about thirteen at that point and it fell to me to put her down. I shot her with a .22 pistol in the woods where she had frequently hunted.
Sorry for the bummer post.
It is said that every man gets one good dog. I had mine when I was quite young. No other dog would be able to measure up, so I moved on to cats.