Minecraft Mods Have Suddenly stopped?

They have stopped working for some reason. They just crash the game. They did work and I don't know why its suddenly stopped. Any Ideas? Its PC version
Repost.

Added (1). I Had
*Mr Crayfish's Furniture mod
*Mo's Creatures
*Dyable Beds
*Custom Mods

Tried to Install
*Copious Dogs
*Jammys Furniture
*The Moon

Whenever I add ANY now It just Crashes

Did minecraft update itself? That can sometimes cause the problem. Without knowing what mods you have on there, your minecraft version, your computer specs and whatnot we're just shooting in the dark man.

I would start over and install one mod at a time, maybe 1 mod was corrupt or didn't mix well with the other mods.

Has minecraft updated? It sounds like your mods are out of date and will therefore not work with the new Minecraft.jar file.

At this point, first try to delete minecraft.jar. Next, check whether your mods are out of date. Refer to your minecraft to see what version it is on. It is likely that the mods are incompatible and will now not function.

Another possibility is an ID conflict. It is highly possible that some of the mods you tried to install have some blocks/items that share the same ID value as some other block or item. In this case, look for the crash report and uninstall the mod that is causing the problem.