So glad this thread has helped so many.
So all of mine get 26-30 squares ea once a day & the other meal is raw, and regardless of whether they weigh 8lb or 2lb they get the same amount. Strangely, it's the 2 bigger ones who seemed to have stacked on the weight and need monitoring, whereas the tinies still maintain the perfect body - it's weird.
So, around 30 squares twice a day seems to be the go from what most are saying here which has really set my mind at ease. Thanks to everyone who took the time & trouble to participate, I'm sure your efforts been very useful to many now & will be in the future too.