
What you have to consider is the current temperament of your dog :-) LKA is indoors, it's big & it's noisey. This is not always the type of Show experienced people would pick to take a pup to for the first time :-) However if you feel your pup is bombproof then go for it.
I like to use the age specific class but it is annoying to be in minor puppy with 20 + and only 4 be in puppy....what breed are you talking about?
You might want to think about going to the show by yourself to see how a Championship Show differs :-)