Agility in NZ

[tilda]

In NZ our agility is four separate classes ,,starters ,novice, intermediate ,and senior , and in each class you have three different height settings ,, mini ,dogs up to 380mm,, midi ,dogs over 380mm up to 460mm,, and maxi, dogs over 460mm, and everybody runs the same course in that class fastest clear time wins .
I was wondering how other countries ran their Agility comps , how they differ etc?
In NZ there's a decline in the bigger breeds competing your German Shepards ,Labs, and I'm the only one in the country that runs Rotties ,
its a shame because they look good in full flight .At the moment the agility rings over here are full of Heading dogs and Border Collies.
Cheers
Tilda