I have a little shih-tzu that I wanted to turn into a zombie dog for Halloween. I also wanted to spend as little money as possible. I went to the Dollar Store and picked up a toddler shirt that looked about his size. I cut off the sleeves and made sure he could fit in it. For the areas where I wanted ripped off flesh, I took masking tape and covered up the shirt. Next I spray painted the shirt with some fluorescent green I had. I pulled off the masking tape and drew blood and bones in those white areas with Sharpie markers.
This was a more cartoon version of a zombie. Non-threatening so kids wouldn't be afraid to pet him.