Hi Lee-Roy, have you enlisted any gypsum to help break down the clay? If not, you can use 1 kilo per square metre and of course it doesn't alter your PH.If there are any horse stables in your area, or across the border, do a Sunday drive.Horse manure contains so much partially/decomposed hay (but also weed seed) and the worms love it, so will your dogs! Build up your worm population and let them do the work.