Further to my above somewhat scrambled post above, I have now gone through the 2007 Wentworth Park race book and identified that there were 19 bithces over 27kg racing that night. I am not surprised because it is my own casual observation that greyhounds of today are significant bigger than in the 1960s, for example. In fact, around the time of 1970 there were more bigger type dogs around due to the imported sires, sires such as Ballymurn Chief and particularly, Knockrour Rambler, who did have some "biggens". Definitely not entirely for all the same reasons but I suppose it parallels how much young people are today compared to my genaration (which is a lot to do with food/protein intake).