I have three unconscious pets that I can't do anything with, but my stable's "revive" option is non-functional. It won't let me use it. Is this option only for if your pets faint from hunger? Is there a way to make it work for pets unconscious from battle? Any help on this would be appreciated.

Have you selected one of the two options presented to you upon clicking the revive pets button on your stable page? I don't have any unconscious pets right now to check with, but as I recall, you have to choose to revive either the pets in the stable you're currently in or in all stables before it will let you confirm and revive c:

Yes, it won't let me click the buttons to select by stable :(

Edited for clarification: the "revive" pop-up box says I have 0 unconscious pets even though 3 are grayed out and the rest of the site tells me they're unconscious so I can't use potions, etc.

Aha, I've figured it out :D You have to remove them from your party, or the stables won't recognize them, for whatever reason.

Huh, weird. I don't have to do that to feed them. Oh well. Thanks for the info!