It's inhumane to separate swing dog from his swing. Plus, If you make him get off, he's just going to get right back on.
At first I felt bad for the little guy, but as it turns out, he seems to really enjoy it. I'll bet if he could have gotten in the swing by himself, he totally would have.
Here's a dog on a swing having the time of his life. (Don't dogs always look like they're having the time of their lives?)