Thankyou all for your feedback! 
wow Jaysee&Dali there so clear brill

I have a 30d and just bought the 70-200 f/2.8l is usm and still got my wrist in a pot as i broke it so can not play

Oh no! 
I'm so jealous! That looks like a blast to shoot. Awesome captures!
It was a blast. I'm just glad I had the 10 races to try and find the right technique, position etc ...
Is there a possibility of getting yourself lower to the ground for these? That's the only composition change I'd make
No chance unfortunately. There was a 4 foot solid fence between me and the track.
Also they look to be a bit on the magenta side to me (is this indoors? I'm curious how #2 ended up a different color)
It was outdoors on a partly cloudy day. I shot RAW so manually adjusted the white balance in Adobe Camera Raw. I'd say I just got this one a bit off. In retrospect, I probably should have adjusted the white balance to all of them at one.
Check with the club regarding photography, before you show up. Some may have exclusive agreements with a photographer, etc.
I just turned up! I quickly checked with the stewards to make sure they didn't have any problems [they were great, only rules were no flash and keep yourself and the camera behind the fence].
There was an "official photographer" present [gidday Dave if you're reading this: I got his email address and promised to send a link if I posted them]. He took a "finishing post" shot for each race and a "winning dog & owner" shot upon request. I ended up having a good chat with him and he showed me some of his work framed and ready to give to the client [my only problem with him was that he shot with a Nikon. Ok, so no one's perfect!
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It was a great learning experience!
cheers,
J&D