Overheating question...

[MosesBrowning]

Does anyone have advice for a seemingly overheated wether?   It's really hot today, & even though we are just hanging out doing stuff around the yard, he started acting strange.   Very restless, staggering a little bit when he gets up, not strong in the hind end, etc.  I know he had water at least once today that I observed, & they have lots of shade to hang out in, but  I have him in the house now to help cool him off a bit, since it's 30 degrees cooler in here than outside.  I have called both of my vet's emergency contact cell numbers, but since it's sunday, I'm not holding my breath for a fast call back.  

I'm doing some research on the best course of action in the meantime while I sit with him, but I figured that some of you may have had experience with this too.  

Thanks in advance.

-Ana