What kind of snake?

[FPS_Fein]

Hi, my names Sean and i recently found a snake my dog was messing with while i was visiting family in central oregon. Im not sure what it is but from what some family members said it was just a garter snake. It would be cool if someone could identify what type it is and possibly help me determine what sex it is? I've had a California king snake when i was younger so im fairly familiar with taking care of snakes but this snake wont even take a pinky. So far the only thing I've been able to get him to eat is fish so if you guys have any suggestions to try anything else let me know. Thanks!