Dogs do not sweat and kevlar is not designed to prevent stabs and/or cuts. Im not a big kevlar fan. Bullet proof vests 40-50+ layers of kevlar and even these do not stop all knife stabs. I think the only kevlar that is designed to prevent cuts and stabs is "turtle skin", which has a tighter weave.
So if you don't use kevlar, what do you use?
the vest im usin now is made out of seatbelt lol and I havent had a hog that can even chew through the leg flaps. I think the kevlar works, especially for how light it is. Mine is not as long as a regular vest, its a "breast plate", but it probably still weighs the same as a regular full length vest. Im not sayin one is write or wrong or anything like that, hell I used to use a bay vest on my cd and they are like one or two layers or somethin and I never got a cut on him in that (had a few slices through it but nothin that broke his skin). I like a dog to move freely, Im willing to give up some protection cuz I feel a good cd should be able to get out of the way and keep himself safe more than the vest keeps him safe. Keep the vitals covered and Im happy.
