Is it a dog or a rat?

Yesterday (early afternoon) we found this dog (Kevin when he saw a picture called it a rat - I guess he doesn't like chihuahuas). It didn't have a collar and we didn't know who it belonged to.

Animal control came out and scanned the male dog for a chip - no chip. Then we put up signs "Found Dog - our phone number". Eventually the owner came and picked it up. I was glad to see it go - the kids were not.