Hi, some stool softeners are safe for kitties. In fact, my vet has my kitty on Docusate Sodium. That's the active ingredient in Colace and some other brands. Take a look at the medicine bottle and if that's the only ingredient you see.....then I promise you...kitty will be fine.
BTW, I've had the liquigel melt in my cats mouth(apparently, I didn't get it down her throat all the way).....and she did that salivating, too. She was not a happy camper in the least.
Let me know what the medicine bottle says!
Good luck!
How long since she has had anything to eat and drink? Is she having difficulty breathing? It may be stuck in her throat. Was this a cat or a human stool softener?