I have been "in" dog shows ALL my life.. literally.. my parents bred/showed/trained Shelties for as long as I could remember...
When I was little I never had a baby play pen.. I was ALWAYS stuck in the puppy pen lol
Anyways, I started showing Riot as soon as it was possible for him to be shown. When he was only 5 months old I had him in Sanction matches (first show he took everything but Best in Show!!!) Then when he turned 6 months (legal CKC show age) he was entered in the "real deal" shows.. he went through a very awkward stage, so never really placed "well" but it was the experience for him and I that I wanted.
Showing can be VERy expensive though.
Traveling costs, show entry fees($25-27/day of the show), hotel costs, grooming supply costs, show appearl costs, show equipment for your dog.
So - if you have the money - its SUCH a fabulous sport. SOO much fun!
Other cons about it would be the politics involved with it. Usually if you get a "beginner" judge they put up professional handlers or the "easy" breeds like Shelties in a group instead of picking apart each dog and assessing them.
I defiantely suggest taking handling classes - if you dont you'll be completely lost in the ring! Handling classes prepare you for proper footwork, proper stacking work for both your dog AND you as well as the proper way to hold leads and handle your dog.
Riot was a very difficult dog to show when we started. I had to work with him consistantly at certain things. Now - hes just fabulous and truely enjoys ring time. He looks PROUD when hes in the ring now! hehe Puffs up his chest, holds his tail evenly, gaits out infront of me(the way he should). He just looks fabulous
Yes, you CAN show your dog when its older. I believe the cut off age is 8yrs old though, anything pass then and they are considered a "vetern" and can only be shown in specialty shows.
I know a Belgian Terv who has JUST finished her title and she is turning 3yrs old. I know of a Sheltie who is just starting his show career at 5 yrs old.
Its also all in how the dog develops and its personality as well as how you handle it in the ring.
There are always going to be certain judges IN the ring as well and you learn about who likes what in a dog.
Ex. would be a "movement judge, an "expression judge", a structure judge etc etc.
So, you should also get your dog assessed by a profesional to see IF in fact that dog IS show quality.