I think that is way too hot for a greyhound. I took Goldie for a easy walk one day, some of it shaded even-- and it was only around 80F - and he sufferered heat exhaustion! His temp went to 107.4F(cellular death occurs at 108F). I could hardly believe it- it really wasn't even that hot out! Thank God he recovered uneventfully. I admit I have been somewhat fanatical about their temp exposure since then. I leave TWO a/c's on. That way if one fails then they will still be cool because the other one will kick on. Aggie is 13 and she simply must not be exposed to any high temps- it could kill her. It don't make sense to me why if they originated in the desert they can't stand heat even as well as an "ordinary" dog but its been my experience they are very heat sensitive. I would be afraid to leave a hound without ac on a hot day. Heat stroke/exhaustion can happen sooo quick and it can be a killer.