I can see how someone who'd never seen a coyote in person could look at a Shiba Inu (especially an older one who's coat wasn't in the best condition anymore, or was maybe a little skinny) and think it was a coyote. Really, the Shiba Inu, Coyote, and Dingo all look similar in terms of size, shape, and even color.
But if it was easily handle-able and friendly, than it should have been blatantly obvious that it was either domesticated or sick, and in either case it shouldn't have been released back into the wild.
isadream - I don't leave collars on my dogs either, for the same reasons. Mine
are both micro-chipped, but you'd be surprised how many shelters don't even have the technology to scan the microchips! Our Shepherd got loose when we weren't home once, and we called the shelter and he was there, and when we picked him up we mentioned that he had a microchip - why didn't they call? They said they couldn't scan them, didn't have the machine!
EDIT: I disagree,
CityChicker. I see at least some Shiba Inu in that dog's face, and from what I can see of the shape of the ears - I am
very involved with our county animal shelter, I see a LOT of dogs, and the staff actually usually comes to me when they're not sure of the breed (although, we have an unspoken agreement around there that most of the obvious pit mixes are called "Lab mixes" - they adopt out much quicker that way), because I've complained so many times - my favorite was the gorgeous, purebred Australian Cattle Dog that they were calling an "Australian Shepherd Mix"!
I have seen a number of Shiba Inu's in person while volunteering at dog events. Remember, it's supposed to be 11 years old, and it may have been loose for quite some time. I'd expect it to be skinny and it's coat wouldn't be in great, poofy condition.