nope and my friend was with me the whole time so he couldnt of done it also It couldnt of been a zombie because something killed the dog and covered the cave with dirt
If you want a Normal minecraft server just go to minecraft.net and go to downloads. download the server thing. then run the server once then there should be some files. and there you go
also you need to portforward if you want to run a server go to Portforward.com to find out how