ORIGINAL: camelcluch
Here are some more for you:

As far as heat goes with black labs, I hunted the Cali/Az dessert with no problems. If a dog can hunt in 115 degree heat, I think that you will be fine.

There's one too. Foot up, tail strong and on point!
what do you feel makes your labs able to take heat??our temps in oct here are around 60 degs max..all our labs get wore out in about 2 hrs or so..
they are in good shape also..at preserve i see same thing, labs tongues hanging out..
this is only problem i see with our labs is they tire out..