Fair enough, I was reading on the net that the dust and chemicals can affect the pad of the dogs. If that is not the case then that's great. Also being that it is concrete there is a chance it will soak up the wee and rain.
Thanks for all the replys so far.
I see what your saying mate, to be honest when concrete is first laid it does give a fair bit of dust off.....there is a dusty residue usually on the top, just swill it over and give it a good brushing a few times. I'm sure all will be well mate if you swill and brush it before putting your juks on it..