There's no way to warn the master.
2 seconds sound clip from the The Brave Little Toaster to the Rescue movie soundboard.
You can hear this line at 00:51:23.607 in the Blu-ray version of the movie.
Quote context
[...]
- And if he's a goner, then our friends are goners too.
- That's it. The animals are doomed.
- There's no way to warn the master.
- Phew!
- Uh, that's it. Load 'em up and ship 'em out. But first, there's a matter of a little cash.
[...]