feist's and mountain cur's are popular with my buddies in SEMO but best squirrel dog ever hunted over was a boxer/collie mix back when I was 15. step mom's dog and only good thing about her and her cursed son's. dog would tree them in the yard and would hang close by and wouldn't range to far in front of us when we hunted and was good at barking treed and would follow them if they jumped.
retired now but still love squirrel hunting and eating them. have savage .410/.22 that is perfect gun IMO. can pop them if they are sitting closeby or more often when they are moving you can get them.