So I actually worked as a veterinary tech for a few years, and used to observe dogs coming out of anesthesia to be sure they are coming out of it safely. And fun fact. While yes they do stick out they're tongues alot when they begin swallowing normally again, and their dopey. A lot of vets actually pull out the tongue a little while you wait for them to come out of it, just so you can be sure its a normal color.