Cute All American Mutt. Head has some Pit features; round and wide between ears.
Enjoy him. You probably will always be guessing from which breeds he came from. Look what is roaming the streets in your area; most likely a combination of these dogs.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015