Scratch

For some background information, I'm using Scratch for a science project. In particular, the Science Buddies "Want to Make a Video Game? Here's How!" science fair project.

I managed to get most of it to work correctly, but when I tried to program "the end of the game", I got totally stuck.  I currently have everything programmed so that when the cat is touched by the dog (which chases the cat), "Game Over" should appear, and all the script running would stop.

BUT, it's not working. I've done some playing around, and it seems that it's not acknowledging that the cat and he dog are touching. I mean, I could be wrong about that, but I've tried the "if touching" command for other things (e.g. cat meows when touching mouse pointer), and they won't work either.

So... help?

(Sorry if this was too long, or hard to understand.)

Oh, and if this helps, here are the current scripts for the cat and game over sprites: