Need more details here, what do you mean you can't find it? You said "back" to working so it did work at some point? Is it in Device Manager, maybe in hidden devices? Make sure it's not disabled or does not have drivers loaded. Did you check the BIOS or mouse settings to make sure it's not disabled there? Did you check the connections to the motherboard?
If so, see that small circular indent on the top left of the touchpad (about the size of a pea). Double tapping that turns the touchpad on and off. You or your cat has probably inadvertantly double tapped it and turned it off.