Well, I dont think its entirely impossible, I've seen Chug's that resemble Pugs more than Chi's, the only thing that gives away the Chi is a more slender body shape and in some cases smaller. that picture is very hard to tell though so I couldn't say for sure.
I agree with AussieNerdQueen, looks like a poorly bred pug to me. I've never heard of a "chug" but I'm guessing that it comes from a pug was crossed with something and given a cutesy name in order to sell (a mutt) for more money.
Hello people, I'm new to the forum and not too familair with dog types but recently got this dog from the shelter and was wondering if anybody could possibly pin point the mix. He looks kinda like a dingo but I'm not sure.