I have both coyotes and wild dogs running around in my area. I've never seen them together, but we have seen groups of either one or the other. The coyotes don't worry me, but the dogs can be dangerous. We had one group of three that had us concerned for awhile, but a lucky running shot at the leader seems to have solved that problem.
From the picture, it looks like a dog to me. Too much hair. Also, coyotes usually avoid homes unless they are desperately hungry, or have learned that there is food there. If they lose there fear of humans and homes, then you will have issues with them and they will keep coming around until you do something about it. I think this is very rare, but in cities where they meet rural areas, it's more common because there's not allot of options for them. Out in the country, coyotes avoid humans as much as possible.
Dogs look at homes and buildings as a safe area and will aproach them looking for food and safety. This is what makes them so dangerous, when they get hungry, they can be very aggressive around a home when trying to get something to eat.
I'd put out some bait for it to get more pics, and if necesary, kill it. Dog food will probably work as good as anything else. Also rake the area smooth and watch for tracks. You might not be getting any more pics because it's moved on to another area.
My last cat was bit by a cotton mouth. It came into the house limping and the vet said this was very common with cats. They are curious about snakes and will aproach them. After it healed, it disapeared a few months later. I'm pretty sure it was bit again, but didn't make it back to the house. It's pretty dificult for a dog to kill a healthy cat. They are very alert and don't have too much trouble avoiding dogs, or getting away from them. In fact, domestic cats that have gone ferel are a very big issue in places because there are no natural preditors for them and they do very well hunting on their own!!!
Eddie