That's alright. You can recondition the clicker and choose another noise to distract Dasher, such as a can of pennies or simply "AH AH!".

I haven't shaped a "Hold It" with Ivy yet but I figure it would work similar to this:
1) C/t (click and treat), c/t, c/t. Stop.
2) Hold out a bone or stick. Every time dog even nudges the bone/stick, click treat. Repeat repeat repeat. Stop.
3) Dog thinks, dog will probably start to mouth the bone/stick. Click treat, repeat repeat repeat. Stop.
4) Dog thinks some more, dog will probably grab the bone/stick from you. Click treat, repeat repeat repeat. Gradually let the dog hold the bone for longer periods of time, all the while marking his good behavior with c/t. Eventually, you can add the cue word.

Again, I haven't personally tried this, but my experience tells me that this is how you should progress. I think I'll try it out tomorrow, in fact