I spent 9 minutes 57 seconds not shooting the puppy. All the way to Level 15. (Thanks Kevy!)

Here's another trick to get a good time if you really want to goose it.

Click start, being very careful not to move the mouse in the process. Then click alt-tab to go to a different window. Move the mouse all you want and check back in with the game window after a period of time (be sure that when you do so the cursor is outside of the game area). Once you've alt-tabbed you can return to the game window at any time and move the mouse all you want as long as you moved it out of the game area while away and don't move it back into the game area while the level is still playing.

Doing this I got up to level 13 without spending even a moment watching that dog do its thing and still did other things at the same time. Then I accidentally moved the mouse while starting a level. Combining my method with Kevy Baby will make it easy to move through all levels (assuming there is an end) without any difficulty and minimal time wasting.

See, I tried that and ended up shooting the dog.
Patience Grasshopper: there are only fifteen levels until you "win"

Hmmm... alt-tab worked fine for me. Maybe it is a browser thing? I was thinking that the game should have a trigger for shooting the gun if the window loses focus. Perhaps Firefox uses a different focus check than IE (if that is the browser you use).

Okay, I get it now.
:D