MINOR PUPPY: For dogs of six and not exceeding nine calendar months of age on the first day of the show. 
PUPPY: For dogs of six and not exceeding twelve calendar months of age on the first day of the show.
JUNIOR:For dogs of six and not exceeding eighteen calendar months of age on the first day of the show.
YEARLING: For dogs of six and not exceeding twenty-four calendar months of age on the first day of the show.
VETERAN - For dogs over 7 years on the first day of the show.
This is where it becomes a little more complicated. There are Maiden, Novice and Mid-limit, Vintage etc classes, but they are few and far between ... the classes below are the regular ones and are based on what you have won.
GRADUATE: For dogs which have not won a Challenge Certificate/CACIB/CAC/Green Star or four or more
First Prizes at Championship Shows in Graduate, Post Graduate, Minor Limit, Mid Limit, Limit and Open
classes, whether restricted or not where Challenge Certificates were offered for the breed.
POST GRADUATE: For dogs which have not won a Challenge Certificate/CACIB/CAC/Green Star or five
or more First Prizes at Championship Shows in Post Graduate, Minor Limit, Mid Limit, Limit and Open
classes, whether restricted or not where Challenge Certificates were offered for the breed.
LIMIT: For dogs which have not become show Champions under The Royal Kennel Club Regulations or under
the rules of any governing body recognised by The Royal Kennel Club, or won 3 or more CC/CACIB/
CAC/Green Stars or won 7 or more First Prizes in all at Championship Shows in Limit
OPEN: For all dogs of the breed for which the class is provided and eligible for entry at the show
So Siska has now won Graduate classes and 4 Post Graduate (PG Classes), So out of Grad and one more class win to go before she's out of PG, limit is a harder class but nothing I can do if she wins out of PG. Orin is already in limit ... and has only won one class to date, so he's in there for a while I would think.
***Edit - Checking my Facts***
As there was no Yearling class Siska won Graduate at WKC and NWGSD last year. This year she has won PGB at WELKS, The National, Blackpool and Leeds. So yes one more win and she's in limit.
