in that case I think you are dealing with a coon, I do not believe your dog did that usually they dont go through the trouble, especially if you never saw it trying to get in the cage again. A racoon is very strong and can open and manipulate just about anything a child can. its those darn tumbs. I am sure if you set a trap thats what you will find.
good luck, again so sorry. I also apologize for not understanding that you were not free ranging him.
good luck, again so sorry. I also apologize for not understanding that you were not free ranging him.