The world is corrupted.
Now I am having troubles loading the save up... after it had trouble loading a chunk the game crashed and when I finally got back on there were the dozens of dogs
No I am not using redstone to open the gate. I will send the crash report soon, my game crashed and when i returned there were a couple dozen dogs that took forever to get rid of.
No, the problem I am having is getting off of a horse and am unable to open a fencegate.
I tried recreating the bug in a new world and it didn't occur.