That my guess too, I was wondering if anyone say anything else. He's a foundling/rehome. Someone found him or something then my parents found him and called the number and found the people who had him last wanted to rehome him so he's found his new spot. his name is Keep-me keepe for short and my mom thought he was a jrt/ig, I think it's just a rat.
That's along the lines of what I was thinking. When I was in high school, I babysat for a couple who had a dog wholooked like a taller version of Keepe, but with a tail. They were told he was a Whippet/terrier mix.