I saw that creature near my home in DE several years ago. I doubt it's the exact same animal, but I've seen it before.
One day I was sitting at my PC next to a window that looks on a nature corridoor. We get deer and all types of other animals pass through it. We've even had bobcat pawprints on our deck after a snowfall. We're just up against the White Clay Creek State Park.
One day I'm sitting there and this dog like animal walks across the path. Then saunters into the woods. Had a bushish tale. Size of a Coyote. It was odd because it was missing a lot of it's fur. Falling out in patches. It was also slightly emaciated. It moved without problem.
I told my dad about it and he frankly thought I was full of shit. A week passed and I hadn't seen it again. But my dad comes homes one day and tells me he's seen the thing. As he was pulling into the drive way it was walking across towards the corridor. He said it had a dead squirrel in its jaws by the head.
We never saw it again. I had never seen anything like it. But after doing a little research I came to the conclusion that it was a Red Wold that was missing several patches of fur. I was watching the discovery channel one night and they were talking about the red wolves in the south. I saw one and it just seemed to fit in with my picture of what I saw.
Here's a picture for comparison, but slightly from behind.
Imagine this animal but missing a large majority of it's fur. It would look a lot like that animal in the image. I saw basically this animal, but 50% of it's fur was missing. That animal looks like it's missing 90% of it's fur.