My rule of thumb is: if you have to ask, it's a coyote. The differences between a wolf and a coyote are unmistakable. VW compared to a Mack truck stark. Especially when you see how they move on the landscape. Wolves are impressive.
It doesn't look like end of summer in your pic........and that's probably about the only time a wolf pup is going to be similar in size to a full grown coyote.